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-3(-1c-12)=-3c-12
We move all terms to the left:
-3(-1c-12)-(-3c-12)=0
We multiply parentheses
3c-(-3c-12)+36=0
We get rid of parentheses
3c+3c+12+36=0
We add all the numbers together, and all the variables
6c+48=0
We move all terms containing c to the left, all other terms to the right
6c=-48
c=-48/6
c=-8
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