-21=-21/u

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Solution for -21=-21/u equation: 



-21=-21/u

We move all terms to the left:

-21-(-21/u)=0



Domain of the equation: u)!=0

u!=0/1

u!=0

u∈R



We get rid of parentheses

21/u-21=0

We multiply all the terms by the denominator


-21*u+21=0

We add all the numbers together, and all the variables

-21u+21=0

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

-21u=-21

u=-21/-21

u=1

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