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c=4c-42
We move all terms to the left:
c-(4c-42)=0
We get rid of parentheses
c-4c+42=0
We add all the numbers together, and all the variables
-3c+42=0
We move all terms containing c to the left, all other terms to the right
-3c=-42
c=-42/-3
c=+14
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