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4c-15=7c+12
We move all terms to the left:
4c-15-(7c+12)=0
We get rid of parentheses
4c-7c-12-15=0
We add all the numbers together, and all the variables
-3c-27=0
We move all terms containing c to the left, all other terms to the right
-3c=27
c=27/-3
c=-9
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