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-3(c+4)=-7c-12
We move all terms to the left:
-3(c+4)-(-7c-12)=0
We multiply parentheses
-3c-(-7c-12)-12=0
We get rid of parentheses
-3c+7c+12-12=0
We add all the numbers together, and all the variables
4c=0
c=0/4
c=0
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