9-3v=21

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Solution for 9-3v=21 equation: 



9-3v=21

We move all terms to the left:

9-3v-(21)=0

We add all the numbers together, and all the variables

-3v-12=0

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

-3v=12

v=12/-3

v=-4

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