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4c-12=8c-80
We move all terms to the left:
4c-12-(8c-80)=0
We get rid of parentheses
4c-8c+80-12=0
We add all the numbers together, and all the variables
-4c+68=0
We move all terms containing c to the left, all other terms to the right
-4c=-68
c=-68/-4
c=+17
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