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OpenStudy (anonymous):
combine like terms and simplify : 10 + 5x - 3y - 7x + 13 + 5y
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OpenStudy (phi):
like terms have the same letter. (but could have different coefficients .. the number in front)
OpenStudy (phi):
for example, you have (among other things) 5x -7x that is 5 x's take away 7 x's. It leaves you with -2 x's or -2x
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