81-5v=4v

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Solution for 81-5v=4v equation: 



81-5v=4v

We move all terms to the left:

81-5v-(4v)=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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