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