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14=3v+4v
We move all terms to the left:
14-(3v+4v)=0
We add all the numbers together, and all the variables
-(+7v)+14=0
We get rid of parentheses
-7v+14=0
We move all terms containing v to the left, all other terms to the right
-7v=-14
v=-14/-7
v=+2
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