-9a-12=3a

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Solution for -9a-12=3a equation: 



-9a-12=3a

We move all terms to the left:

-9a-12-(3a)=0

We add all the numbers together, and all the variables

-12a-12=0

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

-12a=12

a=12/-12

a=-1

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