-a+7=-8

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Solution for -a+7=-8 equation: 



-a+7=-8

We move all terms to the left:

-a+7-(-8)=0

We add all the numbers together, and all the variables

-1a+15=0

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

-a=-15

a=-15/-1

a=+15

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