84/u=4

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Solution for 84/u=4 equation: 



84/u=4

We move all terms to the left:

84/u-(4)=0



Domain of the equation: u!=0

u∈R



We multiply all the terms by the denominator


-4*u+84=0

We add all the numbers together, and all the variables

-4u+84=0

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

-4u=-84

u=-84/-4

u=+21

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