12=-3v-9

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Solution for 12=-3v-9 equation: 



12=-3v-9

We move all terms to the left:

12-(-3v-9)=0

We get rid of parentheses

3v+9+12=0

We add all the numbers together, and all the variables

3v+21=0

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

3v=-21

v=-21/3

v=-7

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