21=2/7u

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Solution for 21=2/7u equation: 



21=2/7u

We move all terms to the left:

21-(2/7u)=0



Domain of the equation: 7u)!=0

u!=0/1

u!=0

u∈R



We add all the numbers together, and all the variables

-(+2/7u)+21=0

We get rid of parentheses

-2/7u+21=0

We multiply all the terms by the denominator


21*7u-2=0

Wy multiply elements

147u-2=0

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

147u=2

u=2/147

u=2/147

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