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18=v/2-15
We move all terms to the left:
18-(v/2-15)=0
We get rid of parentheses
-v/2+15+18=0
We multiply all the terms by the denominator
-v+15*2+18*2=0
We add all the numbers together, and all the variables
-1v+66=0
We move all terms containing v to the left, all other terms to the right
-v=-66
v=-66/-1
v=+66
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