-15=21+2v

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Solution for -15=21+2v equation: 



-15=21+2v

We move all terms to the left:

-15-(21+2v)=0

We add all the numbers together, and all the variables

-(2v+21)-15=0

We get rid of parentheses

-2v-21-15=0

We add all the numbers together, and all the variables

-2v-36=0

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

-2v=36

v=36/-2

v=-18

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