-3a+12-6a=-9

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Solution for -3a+12-6a=-9 equation: 



-3a+12-6a=-9

We move all terms to the left:

-3a+12-6a-(-9)=0

We add all the numbers together, and all the variables

-9a+21=0

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

-9a=-21

a=-21/-9

a=2+1/3

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