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-2c-15+7c=2c+6
We move all terms to the left:
-2c-15+7c-(2c+6)=0
We add all the numbers together, and all the variables
5c-(2c+6)-15=0
We get rid of parentheses
5c-2c-6-15=0
We add all the numbers together, and all the variables
3c-21=0
We move all terms containing c to the left, all other terms to the right
3c=21
c=21/3
c=7
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