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5c+6=-2c-15
We move all terms to the left:
5c+6-(-2c-15)=0
We get rid of parentheses
5c+2c+15+6=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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