(a+3)=-12

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Solution for (a+3)=-12 equation: 



(a+3)=-12

We move all terms to the left:

(a+3)-(-12)=0

We add all the numbers together, and all the variables

(a+3)+12=0

We get rid of parentheses

a+3+12=0

We add all the numbers together, and all the variables

a+15=0

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

a=-15

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