21/u=3

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Solution for 21/u=3 equation: 



21/u=3

We move all terms to the left:

21/u-(3)=0



Domain of the equation: u!=0

u∈R



We multiply all the terms by the denominator


-3*u+21=0

We add all the numbers together, and all the variables

-3u+21=0

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

-3u=-21

u=-21/-3

u=+7

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