X finds out his value/Transcript

(birds chirping)

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(playground chatter)

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♪ Do do do do, do do do ♪

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X, what's wrong? You look depressed.

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Oh, I don't know...

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I just don't know what I am, what my value is.

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Then let's go to the Equation Playground!

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So this is the Equation Playground?

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Yeah!

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And we find an empty seesaw,

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Four: put you on one side,

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Four: And take something else...

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Huh?!

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Four: ...And put it on the other!

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Four: Too heavy!

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So we add some more.

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Four: Nope!

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Ooh! It's equal, now we can figure out your value!

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But Four, there are too many numbers.

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We'll never figure it out.

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Sure we can!

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If we do it step by step, and use a pencil!

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So let's get started.

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One thing we can do is add these two together!

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How did you do that? We weren't even touching!

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They don't have to be.

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X: Could we do it if we were touching?

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Yeah!

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We can also put these together!

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X: Five?

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Wouldn't it be eleven, because 8+3=11?

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No.

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Four: Because we're putting together 8 and -3, or negative three.

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Four: So it's FIVE!

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Oh...

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I see something! We can add these.

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Four & X: OOF!

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Why did that happen?

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Because the 2 is connected to the (3+x).

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Oh! Uh... so?

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It's like adding apples and oranges-- you can't!

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So what do we do?

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Okay, see the 2(3+x)?

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X: Yeah...?

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Four: That's the same as: 2 times 3, plus 2 times x,

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Four: Which is 6+2x.

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X: Oh! and 5+6=11!

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Four: Yes. Now we have to move things around!

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We have to move this 2x to this side.

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Oh! So, 5x...

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Four & X: OOF!

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Whenever you switch sides, you have to switch its sign.

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So if it's positive, it turns negative, and vice versa.

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WHY?

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Think of it this way:

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Four: You're subtracting 2x from each side!

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X: Oh, so it'd be just 1x, or x.

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Correct! Now do the same with me, Four.

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Oh, okay. 11-4=7.

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So now what do I do?

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Four: What's there left to do?

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X: Oh! x=7, so I'm seven!

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Yeah! And it's lucky, too!

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Hmph!

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Four: So now that you know your value,

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Four: What do you want to do?

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X: I'm gonna celebrate by playing with Five and Three!

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Four: Hmm... sounds FUN!