7-1/z=9

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Solution for 7-1/z=9 equation: 


D( z )

z = 0

z = 0

z = 0

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

7-(1/z) = 9 // - 9

7-(1/z)-9 = 0

7-z^-1-9 = 0

-1*z^-1 = 2 // : -1

z^-1 = -2

-1 < 0

1/(z^1) = -2 // * z^1

1 = -2*z^1 // : -2

-1/2 = z^1

z = -1/2

z = -1/2

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