21=2v-15

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Solution for 21=2v-15 equation: 



21=2v-15

We move all terms to the left:

21-(2v-15)=0

We get rid of parentheses

-2v+15+21=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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