3(7v-1)=81

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Solution for 3(7v-1)=81 equation: 



3(7v-1)=81

We move all terms to the left:

3(7v-1)-(81)=0

We multiply parentheses

21v-3-81=0

We add all the numbers together, and all the variables

21v-84=0

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

21v=84

v=84/21

v=4

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