4/z=10/9

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Solution for 4/z=10/9 equation: 


D( z )

z = 0

z = 0

z = 0

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

4/z = 10/9 // - 10/9

4/z-(10/9) = 0

4/z-10/9 = 0

4*z^-1 = 10/9 // : 4

z^-1 = 5/18

-1 < 0

1/(z^1) = 5/18 // * z^1

1 = 5/18*z^1 // : 5/18

18/5 = z^1

z = 18/5

z = 18/5

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