3v+9=81-9v

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Solution for 3v+9=81-9v equation: 



3v+9=81-9v

We move all terms to the left:

3v+9-(81-9v)=0

We add all the numbers together, and all the variables

3v-(-9v+81)+9=0

We get rid of parentheses

3v+9v-81+9=0

We add all the numbers together, and all the variables

12v-72=0

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

12v=72

v=72/12

v=6

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