21=3/7uu=

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Solution for 21=3/7uu= equation: 



21=3/7uu=

We move all terms to the left:

21-(3/7uu)=0



Domain of the equation: 7uu)!=0

u!=0/1

u!=0

u∈R



We add all the numbers together, and all the variables

-(+3/7uu)+21=0

We get rid of parentheses

-3/7uu+21=0

We multiply all the terms by the denominator


21*7uu-3=0

Wy multiply elements

147u-3=0

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

147u=3

u=3/147

u=1/49

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