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-12-4(6-a)=0
We add all the numbers together, and all the variables
-4(-1a+6)-12=0
We multiply parentheses
4a-24-12=0
We add all the numbers together, and all the variables
4a-36=0
We move all terms containing a to the left, all other terms to the right
4a=36
a=36/4
a=9
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