39=3v+21

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Solution for 39=3v+21 equation: 



39=3v+21

We move all terms to the left:

39-(3v+21)=0

We get rid of parentheses

-3v-21+39=0

We add all the numbers together, and all the variables

-3v+18=0

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

-3v=-18

v=-18/-3

v=+6

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