9-8v=21-2v

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Solution for 9-8v=21-2v equation: 



9-8v=21-2v

We move all terms to the left:

9-8v-(21-2v)=0

We add all the numbers together, and all the variables

-8v-(-2v+21)+9=0

We get rid of parentheses

-8v+2v-21+9=0

We add all the numbers together, and all the variables

-6v-12=0

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

-6v=12

v=12/-6

v=-2

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