12=12v-9v

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Solution for 12=12v-9v equation: 



12=12v-9v

We move all terms to the left:

12-(12v-9v)=0

We add all the numbers together, and all the variables

-(+3v)+12=0

We get rid of parentheses

-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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