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9c-6=12c+15
We move all terms to the left:
9c-6-(12c+15)=0
We get rid of parentheses
9c-12c-15-6=0
We add all the numbers together, and all the variables
-3c-21=0
We move all terms containing c to the left, all other terms to the right
-3c=21
c=21/-3
c=-7
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