21=-7/9u

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Solution for 21=-7/9u equation: 



21=-7/9u

We move all terms to the left:

21-(-7/9u)=0



Domain of the equation: 9u)!=0

u!=0/1

u!=0

u∈R



We get rid of parentheses

7/9u+21=0

We multiply all the terms by the denominator


21*9u+7=0

Wy multiply elements

189u+7=0

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

189u=-7

u=-7/189

u=-1/27

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