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12c-31=4c+25
We move all terms to the left:
12c-31-(4c+25)=0
We get rid of parentheses
12c-4c-25-31=0
We add all the numbers together, and all the variables
8c-56=0
We move all terms containing c to the left, all other terms to the right
8c=56
c=56/8
c=7
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