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4=2v/9
We move all terms to the left:
4-(2v/9)=0
We add all the numbers together, and all the variables
-(+2v/9)+4=0
We get rid of parentheses
-2v/9+4=0
We multiply all the terms by the denominator
-2v+4*9=0
We add all the numbers together, and all the variables
-2v+36=0
We move all terms containing v to the left, all other terms to the right
-2v=-36
v=-36/-2
v=+18
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