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21=v/5+9
We move all terms to the left:
21-(v/5+9)=0
We get rid of parentheses
-v/5-9+21=0
We multiply all the terms by the denominator
-v-9*5+21*5=0
We add all the numbers together, and all the variables
-1v+60=0
We move all terms containing v to the left, all other terms to the right
-v=-60
v=-60/-1
v=+60
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