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20-c=4c-7
We move all terms to the left:
20-c-(4c-7)=0
We add all the numbers together, and all the variables
-1c-(4c-7)+20=0
We get rid of parentheses
-1c-4c+7+20=0
We add all the numbers together, and all the variables
-5c+27=0
We move all terms containing c to the left, all other terms to the right
-5c=-27
c=-27/-5
c=5+2/5
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