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18=3c/8-9
We move all terms to the left:
18-(3c/8-9)=0
We get rid of parentheses
-3c/8+9+18=0
We multiply all the terms by the denominator
-3c+9*8+18*8=0
We add all the numbers together, and all the variables
-3c+216=0
We move all terms containing c to the left, all other terms to the right
-3c=-216
c=-216/-3
c=+72
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