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18=3q-9
We move all terms to the left:
18-(3q-9)=0
We get rid of parentheses
-3q+9+18=0
We add all the numbers together, and all the variables
-3q+27=0
We move all terms containing q to the left, all other terms to the right
-3q=-27
q=-27/-3
q=+9
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