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18+20c=5c-15+18c
We move all terms to the left:
18+20c-(5c-15+18c)=0
We add all the numbers together, and all the variables
20c-(23c-15)+18=0
We get rid of parentheses
20c-23c+15+18=0
We add all the numbers together, and all the variables
-3c+33=0
We move all terms containing c to the left, all other terms to the right
-3c=-33
c=-33/-3
c=+11
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