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20=2.5v
We move all terms to the left:
20-(2.5v)=0
We add all the numbers together, and all the variables
-(+2.5v)+20=0
We get rid of parentheses
-2.5v+20=0
We move all terms containing v to the left, all other terms to the right
-2.5v=-20
v=-20/-2.5
v=+8
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