-12=8+6a-a

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Solution for -12=8+6a-a equation: 



-12=8+6a-a

We move all terms to the left:

-12-(8+6a-a)=0

We add all the numbers together, and all the variables

-(5a+8)-12=0

We get rid of parentheses

-5a-8-12=0

We add all the numbers together, and all the variables

-5a-20=0

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

-5a=20

a=20/-5

a=-4

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