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-8c+13=-7c
We move all terms to the left:
-8c+13-(-7c)=0
We get rid of parentheses
-8c+7c+13=0
We add all the numbers together, and all the variables
-1c+13=0
We move all terms containing c to the left, all other terms to the right
-c=-13
c=-13/-1
c=+13
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