21=3v-15

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Solution for 21=3v-15 equation: 



21=3v-15

We move all terms to the left:

21-(3v-15)=0

We get rid of parentheses

-3v+15+21=0

We add all the numbers together, and all the variables

-3v+36=0

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

-3v=-36

v=-36/-3

v=+12

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