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45=4v+v
We move all terms to the left:
45-(4v+v)=0
We add all the numbers together, and all the variables
-(+5v)+45=0
We get rid of parentheses
-5v+45=0
We move all terms containing v to the left, all other terms to the right
-5v=-45
v=-45/-5
v=+9
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