12-3v=-21

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Solution for 12-3v=-21 equation: 



12-3v=-21

We move all terms to the left:

12-3v-(-21)=0

We add all the numbers together, and all the variables

-3v+33=0

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

-3v=-33

v=-33/-3

v=+11

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