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-9(v+1)=72
We move all terms to the left:
-9(v+1)-(72)=0
We multiply parentheses
-9v-9-72=0
We add all the numbers together, and all the variables
-9v-81=0
We move all terms containing v to the left, all other terms to the right
-9v=81
v=81/-9
v=-9
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