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8v=9v+7
We move all terms to the left:
8v-(9v+7)=0
We get rid of parentheses
8v-9v-7=0
We add all the numbers together, and all the variables
-1v-7=0
We move all terms containing v to the left, all other terms to the right
-v=7
v=7/-1
v=-7
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