-(a-12)+4a=9a

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Solution for -(a-12)+4a=9a equation: 



-(a-12)+4a=9a

We move all terms to the left:

-(a-12)+4a-(9a)=0

We add all the numbers together, and all the variables

-5a-(a-12)=0

We get rid of parentheses

-5a-a+12=0

We add all the numbers together, and all the variables

-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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