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18+18c=13c-12
We move all terms to the left:
18+18c-(13c-12)=0
We get rid of parentheses
18c-13c+12+18=0
We add all the numbers together, and all the variables
5c+30=0
We move all terms containing c to the left, all other terms to the right
5c=-30
c=-30/5
c=-6
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