-15=a-12

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Solution for -15=a-12 equation: 



-15=a-12

We move all terms to the left:

-15-(a-12)=0

We get rid of parentheses

-a+12-15=0

We add all the numbers together, and all the variables

-1a-3=0

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

-a=3

a=3/-1

a=-3

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