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-20+c=-7c+20
We move all terms to the left:
-20+c-(-7c+20)=0
We get rid of parentheses
c+7c-20-20=0
We add all the numbers together, and all the variables
8c-40=0
We move all terms containing c to the left, all other terms to the right
8c=40
c=40/8
c=5
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