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-8c+20=-13c-20
We move all terms to the left:
-8c+20-(-13c-20)=0
We get rid of parentheses
-8c+13c+20+20=0
We add all the numbers together, and all the variables
5c+40=0
We move all terms containing c to the left, all other terms to the right
5c=-40
c=-40/5
c=-8
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