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-9c-18=-15c+18
We move all terms to the left:
-9c-18-(-15c+18)=0
We get rid of parentheses
-9c+15c-18-18=0
We add all the numbers together, and all the variables
6c-36=0
We move all terms containing c to the left, all other terms to the right
6c=36
c=36/6
c=6
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