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9c+3=15c+15
We move all terms to the left:
9c+3-(15c+15)=0
We get rid of parentheses
9c-15c-15+3=0
We add all the numbers together, and all the variables
-6c-12=0
We move all terms containing c to the left, all other terms to the right
-6c=12
c=12/-6
c=-2
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