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80=9c+7c
We move all terms to the left:
80-(9c+7c)=0
We add all the numbers together, and all the variables
-(+16c)+80=0
We get rid of parentheses
-16c+80=0
We move all terms containing c to the left, all other terms to the right
-16c=-80
c=-80/-16
c=+5
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