8v+v=81

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Solution for 8v+v=81 equation: 



8v+v=81

We move all terms to the left:

8v+v-(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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