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31=-7c+4
We move all terms to the left:
31-(-7c+4)=0
We get rid of parentheses
7c-4+31=0
We add all the numbers together, and all the variables
7c+27=0
We move all terms containing c to the left, all other terms to the right
7c=-27
c=-27/7
c=-3+6/7
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