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81=16v-7v
We move all terms to the left:
81-(16v-7v)=0
We add all the numbers together, and all the variables
-(+9v)+81=0
We get rid of parentheses
-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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