-12=8+4a

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Solution for -12=8+4a equation: 



-12=8+4a

We move all terms to the left:

-12-(8+4a)=0

We add all the numbers together, and all the variables

-(4a+8)-12=0

We get rid of parentheses

-4a-8-12=0

We add all the numbers together, and all the variables

-4a-20=0

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

-4a=20

a=20/-4

a=-5

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