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9v=5v+20
We move all terms to the left:
9v-(5v+20)=0
We get rid of parentheses
9v-5v-20=0
We add all the numbers together, and all the variables
4v-20=0
We move all terms containing v to the left, all other terms to the right
4v=20
v=20/4
v=5
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