12=11a-9a

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Solution for 12=11a-9a equation: 



12=11a-9a

We move all terms to the left:

12-(11a-9a)=0

We add all the numbers together, and all the variables

-(+2a)+12=0

We get rid of parentheses

-2a+12=0

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

-2a=-12

a=-12/-2

a=+6

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