-21=-21/3v

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Solution for -21=-21/3v equation: 



-21=-21/3v

We move all terms to the left:

-21-(-21/3v)=0



Domain of the equation: 3v)!=0

v!=0/1

v!=0

v∈R



We get rid of parentheses

21/3v-21=0

We multiply all the terms by the denominator


-21*3v+21=0

Wy multiply elements

-63v+21=0

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

-63v=-21

v=-21/-63

v=1/3

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