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-3(c-18)=3c-18
We move all terms to the left:
-3(c-18)-(3c-18)=0
We multiply parentheses
-3c-(3c-18)+54=0
We get rid of parentheses
-3c-3c+18+54=0
We add all the numbers together, and all the variables
-6c+72=0
We move all terms containing c to the left, all other terms to the right
-6c=-72
c=-72/-6
c=+12
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