12a-3a=-27

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Solution for 12a-3a=-27 equation: 



12a-3a=-27

We move all terms to the left:

12a-3a-(-27)=0

We add all the numbers together, and all the variables

9a+27=0

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

9a=-27

a=-27/9

a=-3

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