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9c+15=3c+17
We move all terms to the left:
9c+15-(3c+17)=0
We get rid of parentheses
9c-3c-17+15=0
We add all the numbers together, and all the variables
6c-2=0
We move all terms containing c to the left, all other terms to the right
6c=2
c=2/6
c=1/3
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