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-2+7c=9c-18
We move all terms to the left:
-2+7c-(9c-18)=0
We get rid of parentheses
7c-9c+18-2=0
We add all the numbers together, and all the variables
-2c+16=0
We move all terms containing c to the left, all other terms to the right
-2c=-16
c=-16/-2
c=+8
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