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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
3.8/5.2 = 7.5/z // - 7.5/z
3.8/5.2-(7.5/z) = 0
3.8/5.2-7.5*z^-1 = 0
-7.5*z^-1 = -0.73076923 // : -7.5
z^-1 = 0.0974359
-1 < 0
1/(z^1) = 0.0974359 // * z^1
1 = 0.0974359*z^1 // : 0.0974359
10.26315762 = z^1
z = 10.26315762
z = 10.26315762
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