12=a-7a

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Solution for 12=a-7a equation: 



12=a-7a

We move all terms to the left:

12-(a-7a)=0

We add all the numbers together, and all the variables

-(-6a)+12=0

We get rid of parentheses

6a+12=0

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

6a=-12

a=-12/6

a=-2

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