(9/z)-(2/z)=21

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Solution for (9/z)-(2/z)=21 equation: 


D( z )

z = 0

z = 0

z = 0

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

9/z-(2/z) = 21 // - 21

9/z-(2/z)-21 = 0

9/z-2*z^-1-21 = 0

7*z^-1 = 21 // : 7

z^-1 = 3

-1 < 0

1/(z^1) = 3 // * z^1

1 = 3*z^1 // : 3

1/3 = z^1

z = 1/3

z = 1/3

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