21=3v+6

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Solution for 21=3v+6 equation: 



21=3v+6

We move all terms to the left:

21-(3v+6)=0

We get rid of parentheses

-3v-6+21=0

We add all the numbers together, and all the variables

-3v+15=0

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

-3v=-15

v=-15/-3

v=+5

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