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4c-51=5c-91
We move all terms to the left:
4c-51-(5c-91)=0
We get rid of parentheses
4c-5c+91-51=0
We add all the numbers together, and all the variables
-1c+40=0
We move all terms containing c to the left, all other terms to the right
-c=-40
c=-40/-1
c=+40
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