21=3/u-13

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Solution for 21=3/u-13 equation: 



21=3/u-13

We move all terms to the left:

21-(3/u-13)=0



Domain of the equation: u-13)!=0

u∈R



We get rid of parentheses

-3/u+13+21=0

We multiply all the terms by the denominator


13*u+21*u-3=0

We add all the numbers together, and all the variables

34u-3=0

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

34u=3

u=3/34

u=3/34

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