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-20-18-c=6c+18
We move all terms to the left:
-20-18-c-(6c+18)=0
We add all the numbers together, and all the variables
-1c-(6c+18)-38=0
We get rid of parentheses
-1c-6c-18-38=0
We add all the numbers together, and all the variables
-7c-56=0
We move all terms containing c to the left, all other terms to the right
-7c=56
c=56/-7
c=-8
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