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45=-9v+4v
We move all terms to the left:
45-(-9v+4v)=0
We add all the numbers together, and all the variables
-(-5v)+45=0
We get rid of parentheses
5v+45=0
We move all terms containing v to the left, all other terms to the right
5v=-45
v=-45/5
v=-9
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