a-12=-6+7a

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Solution for a-12=-6+7a equation: 



a-12=-6+7a

We move all terms to the left:

a-12-(-6+7a)=0

We add all the numbers together, and all the variables

a-(7a-6)-12=0

We get rid of parentheses

a-7a+6-12=0

We add all the numbers together, and all the variables

-6a-6=0

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

-6a=6

a=6/-6

a=-1

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