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20=14v-9v
We move all terms to the left:
20-(14v-9v)=0
We add all the numbers together, and all the variables
-(+5v)+20=0
We get rid of parentheses
-5v+20=0
We move all terms containing v to the left, all other terms to the right
-5v=-20
v=-20/-5
v=+4
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