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18=4v+5v
We move all terms to the left:
18-(4v+5v)=0
We add all the numbers together, and all the variables
-(+9v)+18=0
We get rid of parentheses
-9v+18=0
We move all terms containing v to the left, all other terms to the right
-9v=-18
v=-18/-9
v=+2
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