-7/9u=21

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Solution for -7/9u=21 equation: 



-7/9u=21

We move all terms to the left:

-7/9u-(21)=0



Domain of the equation: 9u!=0

u!=0/9

u!=0

u∈R



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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