-12=-21-v

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Solution for -12=-21-v equation: 



-12=-21-v

We move all terms to the left:

-12-(-21-v)=0

We add all the numbers together, and all the variables

-(-1v-21)-12=0

We get rid of parentheses

1v+21-12=0

We add all the numbers together, and all the variables

v+9=0

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

v=-9

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