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18=3c+9
We move all terms to the left:
18-(3c+9)=0
We get rid of parentheses
-3c-9+18=0
We add all the numbers together, and all the variables
-3c+9=0
We move all terms containing c to the left, all other terms to the right
-3c=-9
c=-9/-3
c=+3
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