-21=3v-3

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Solution for -21=3v-3 equation: 



-21=3v-3

We move all terms to the left:

-21-(3v-3)=0

We get rid of parentheses

-3v+3-21=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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