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20=3v+v
We move all terms to the left:
20-(3v+v)=0
We add all the numbers together, and all the variables
-(+4v)+20=0
We get rid of parentheses
-4v+20=0
We move all terms containing v to the left, all other terms to the right
-4v=-20
v=-20/-4
v=+5
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