-12=-6a+3a

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



-12=-6a+3a

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(-3a)-12=0

We get rid of parentheses

3a-12=0

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

3a=12

a=12/3

a=4

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