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10c-28=3c-7
We move all terms to the left:
10c-28-(3c-7)=0
We get rid of parentheses
10c-3c+7-28=0
We add all the numbers together, and all the variables
7c-21=0
We move all terms containing c to the left, all other terms to the right
7c=21
c=21/7
c=3
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