21=7/2u

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Solution for 21=7/2u equation: 



21=7/2u

We move all terms to the left:

21-(7/2u)=0



Domain of the equation: 2u)!=0

u!=0/1

u!=0

u∈R



We add all the numbers together, and all the variables

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

We get rid of parentheses

-7/2u+21=0

We multiply all the terms by the denominator


21*2u-7=0

Wy multiply elements

42u-7=0

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

42u=7

u=7/42

u=1/6

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