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9v=4v+40
We move all terms to the left:
9v-(4v+40)=0
We get rid of parentheses
9v-4v-40=0
We add all the numbers together, and all the variables
5v-40=0
We move all terms containing v to the left, all other terms to the right
5v=40
v=40/5
v=8
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