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-9(v+9)=8v-13
We move all terms to the left:
-9(v+9)-(8v-13)=0
We multiply parentheses
-9v-(8v-13)-81=0
We get rid of parentheses
-9v-8v+13-81=0
We add all the numbers together, and all the variables
-17v-68=0
We move all terms containing v to the left, all other terms to the right
-17v=68
v=68/-17
v=-4
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