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-20+9c-20=4c+20
We move all terms to the left:
-20+9c-20-(4c+20)=0
We add all the numbers together, and all the variables
9c-(4c+20)-40=0
We get rid of parentheses
9c-4c-20-40=0
We add all the numbers together, and all the variables
5c-60=0
We move all terms containing c to the left, all other terms to the right
5c=60
c=60/5
c=12
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