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6c+15=4c-12
We move all terms to the left:
6c+15-(4c-12)=0
We get rid of parentheses
6c-4c+12+15=0
We add all the numbers together, and all the variables
2c+27=0
We move all terms containing c to the left, all other terms to the right
2c=-27
c=-27/2
c=-13+1/2
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