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40=2v+3v
We move all terms to the left:
40-(2v+3v)=0
We add all the numbers together, and all the variables
-(+5v)+40=0
We get rid of parentheses
-5v+40=0
We move all terms containing v to the left, all other terms to the right
-5v=-40
v=-40/-5
v=+8
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