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4=9v-5v
We move all terms to the left:
4-(9v-5v)=0
We add all the numbers together, and all the variables
-(+4v)+4=0
We get rid of parentheses
-4v+4=0
We move all terms containing v to the left, all other terms to the right
-4v=-4
v=-4/-4
v=1
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