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5c-15=c+6
We move all terms to the left:
5c-15-(c+6)=0
We get rid of parentheses
5c-c-6-15=0
We add all the numbers together, and all the variables
4c-21=0
We move all terms containing c to the left, all other terms to the right
4c=21
c=21/4
c=5+1/4
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