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-9=-15+v/3
We move all terms to the left:
-9-(-15+v/3)=0
We add all the numbers together, and all the variables
-(v/3-15)-9=0
We get rid of parentheses
-v/3+15-9=0
We multiply all the terms by the denominator
-v+15*3-9*3=0
We add all the numbers together, and all the variables
-1v+18=0
We move all terms containing v to the left, all other terms to the right
-v=-18
v=-18/-1
v=+18
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