21=9/x

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Solution for 21=9/x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

21 = 9/x // - 9/x

21-(9/x) = 0

21-9*x^-1 = 0

-9*x^-1 = -21 // : -9

x^-1 = 7/3

-1 < 0

1/(x^1) = 7/3 // * x^1

1 = 7/3*x^1 // : 7/3

3/7 = x^1

x = 3/7

x = 3/7

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