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12c+8-3c+13=5c-31
We move all terms to the left:
12c+8-3c+13-(5c-31)=0
We add all the numbers together, and all the variables
9c-(5c-31)+21=0
We get rid of parentheses
9c-5c+31+21=0
We add all the numbers together, and all the variables
4c+52=0
We move all terms containing c to the left, all other terms to the right
4c=-52
c=-52/4
c=-13
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