12-a=-15

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Solution for 12-a=-15 equation: 



12-a=-15

We move all terms to the left:

12-a-(-15)=0

We add all the numbers together, and all the variables

-1a+27=0

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

-a=-27

a=-27/-1

a=+27

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