"I think you've swapped these numbers around somehow," JC said. He erased the equation and wrote it down again, correctly. "See, it didn't make sense the way you had it, because the coefficient -"

"Is it right, the way you wrote it?" Justin said, pointing with his pencil.

"Yeah, I think so."

"Great. Then let's do number ten."

"Justin," JC laughed, "come on. You've got to at least try to understand this."

"No, I don't."

"Come on. If you can do music you can do math."

"No, I can't."

"Why not?"

"Because," Justin said, grinning, "I want to do music and I don't want to do math. Now do number ten and then we'll only have five more to go."

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