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99=8v+3
We move all terms to the left:
99-(8v+3)=0
We get rid of parentheses
-8v-3+99=0
We add all the numbers together, and all the variables
-8v+96=0
We move all terms containing v to the left, all other terms to the right
-8v=-96
v=-96/-8
v=+12
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