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5c-21=c+23
We move all terms to the left:
5c-21-(c+23)=0
We get rid of parentheses
5c-c-23-21=0
We add all the numbers together, and all the variables
4c-44=0
We move all terms containing c to the left, all other terms to the right
4c=44
c=44/4
c=11
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