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15c-15=2c+6
We move all terms to the left:
15c-15-(2c+6)=0
We get rid of parentheses
15c-2c-6-15=0
We add all the numbers together, and all the variables
13c-21=0
We move all terms containing c to the left, all other terms to the right
13c=21
c=21/13
c=1+8/13
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