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7c-72=8c-86
We move all terms to the left:
7c-72-(8c-86)=0
We get rid of parentheses
7c-8c+86-72=0
We add all the numbers together, and all the variables
-1c+14=0
We move all terms containing c to the left, all other terms to the right
-c=-14
c=-14/-1
c=+14
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