21=7/8u

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Solution for 21=7/8u equation: 



21=7/8u

We move all terms to the left:

21-(7/8u)=0



Domain of the equation: 8u)!=0

u!=0/1

u!=0

u∈R



We add all the numbers together, and all the variables

-(+7/8u)+21=0

We get rid of parentheses

-7/8u+21=0

We multiply all the terms by the denominator


21*8u-7=0

Wy multiply elements

168u-7=0

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

168u=7

u=7/168

u=1/24

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