-21=-7/3u

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Solution for -21=-7/3u equation: 



-21=-7/3u

We move all terms to the left:

-21-(-7/3u)=0



Domain of the equation: 3u)!=0

u!=0/1

u!=0

u∈R



We get rid of parentheses

7/3u-21=0

We multiply all the terms by the denominator


-21*3u+7=0

Wy multiply elements

-63u+7=0

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

-63u=-7

u=-7/-63

u=1/9

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