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-3(-4)+=4C-12
We move all terms to the left:
-3(-4)+-(4C-12)=0
We add all the numbers together, and all the variables
-(4C-12)=0
We get rid of parentheses
-4C+12=0
We move all terms containing C to the left, all other terms to the right
-4C=-12
C=-12/-4
C=+3
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