21=3/4u

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Solution for 21=3/4u equation: 



21=3/4u

We move all terms to the left:

21-(3/4u)=0



Domain of the equation: 4u)!=0

u!=0/1

u!=0

u∈R



We add all the numbers together, and all the variables

-(+3/4u)+21=0

We get rid of parentheses

-3/4u+21=0

We multiply all the terms by the denominator


21*4u-3=0

Wy multiply elements

84u-3=0

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

84u=3

u=3/84

u=1/28

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