a-(3a+4)=-12

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Solution for a-(3a+4)=-12 equation: 



a-(3a+4)=-12

We move all terms to the left:

a-(3a+4)-(-12)=0

We add all the numbers together, and all the variables

a-(3a+4)+12=0

We get rid of parentheses

a-3a-4+12=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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