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20-6c=4c-15
We move all terms to the left:
20-6c-(4c-15)=0
We get rid of parentheses
-6c-4c+15+20=0
We add all the numbers together, and all the variables
-10c+35=0
We move all terms containing c to the left, all other terms to the right
-10c=-35
c=-35/-10
c=3+1/2
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