-2a+7=15

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Solution for -2a+7=15 equation: 



-2a+7=15

We move all terms to the left:

-2a+7-(15)=0

We add all the numbers together, and all the variables

-2a-8=0

We move all terms containing a to the left, all other terms to the right

-2a=8

a=8/-2

a=-4

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