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-(12-3c)=-66
We move all terms to the left:
-(12-3c)-(-66)=0
We add all the numbers together, and all the variables
-(-3c+12)-(-66)=0
We add all the numbers together, and all the variables
-(-3c+12)+66=0
We get rid of parentheses
3c-12+66=0
We add all the numbers together, and all the variables
3c+54=0
We move all terms containing c to the left, all other terms to the right
3c=-54
c=-54/3
c=-18
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