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c=4c-93
We move all terms to the left:
c-(4c-93)=0
We get rid of parentheses
c-4c+93=0
We add all the numbers together, and all the variables
-3c+93=0
We move all terms containing c to the left, all other terms to the right
-3c=-93
c=-93/-3
c=+31
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