Question: I'm having trouble figuring out how to write an algebraic expression from word problems, such as this one particularly: Eric has rock and classical MP3s

I'm having trouble figuring out how to write an algebraic expression from word problems, such as this one particularly:

Eric has rock and classical MP3s on his computer. The number of rock MP3s is 3 times more than the number of classical MP3s. Let c represent the number of classical MP3s.

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