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18=v+2v
We move all terms to the left:
18-(v+2v)=0
We add all the numbers together, and all the variables
-(+3v)+18=0
We get rid of parentheses
-3v+18=0
We move all terms containing v to the left, all other terms to the right
-3v=-18
v=-18/-3
v=+6
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