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4c-21=-3c+7
We move all terms to the left:
4c-21-(-3c+7)=0
We get rid of parentheses
4c+3c-7-21=0
We add all the numbers together, and all the variables
7c-28=0
We move all terms containing c to the left, all other terms to the right
7c=28
c=28/7
c=4
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