81=9-8v

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Solution for 81=9-8v equation: 



81=9-8v

We move all terms to the left:

81-(9-8v)=0

We add all the numbers together, and all the variables

-(-8v+9)+81=0

We get rid of parentheses

8v-9+81=0

We add all the numbers together, and all the variables

8v+72=0

We move all terms containing v to the left, all other terms to the right

8v=-72

v=-72/8

v=-9

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