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16v=7v+81
We move all terms to the left:
16v-(7v+81)=0
We get rid of parentheses
16v-7v-81=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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