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71=4v-9
We move all terms to the left:
71-(4v-9)=0
We get rid of parentheses
-4v+9+71=0
We add all the numbers together, and all the variables
-4v+80=0
We move all terms containing v to the left, all other terms to the right
-4v=-80
v=-80/-4
v=+20
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