9a-12-a=6a

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Solution for 9a-12-a=6a equation: 



9a-12-a=6a

We move all terms to the left:

9a-12-a-(6a)=0

We add all the numbers together, and all the variables

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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