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-5c+8=-7c-8
We move all terms to the left:
-5c+8-(-7c-8)=0
We get rid of parentheses
-5c+7c+8+8=0
We add all the numbers together, and all the variables
2c+16=0
We move all terms containing c to the left, all other terms to the right
2c=-16
c=-16/2
c=-8
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