-9-8a=12-a

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Solution for -9-8a=12-a equation: 



-9-8a=12-a

We move all terms to the left:

-9-8a-(12-a)=0

We add all the numbers together, and all the variables

-8a-(-1a+12)-9=0

We get rid of parentheses

-8a+1a-12-9=0

We add all the numbers together, and all the variables

-7a-21=0

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

-7a=21

a=21/-7

a=-3

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