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1591=8v-9
We move all terms to the left:
1591-(8v-9)=0
We get rid of parentheses
-8v+9+1591=0
We add all the numbers together, and all the variables
-8v+1600=0
We move all terms containing v to the left, all other terms to the right
-8v=-1600
v=-1600/-8
v=+200
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