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8c-12=3c+18
We move all terms to the left:
8c-12-(3c+18)=0
We get rid of parentheses
8c-3c-18-12=0
We add all the numbers together, and all the variables
5c-30=0
We move all terms containing c to the left, all other terms to the right
5c=30
c=30/5
c=6
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