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27=9c-18
We move all terms to the left:
27-(9c-18)=0
We get rid of parentheses
-9c+18+27=0
We add all the numbers together, and all the variables
-9c+45=0
We move all terms containing c to the left, all other terms to the right
-9c=-45
c=-45/-9
c=+5
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