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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
0.45/z = 900/58.3 // - 900/58.3
0.45/z-(900/58.3) = 0
0.45/z-15.4373928 = 0
0.45*z^-1 = 15.4373928 // : 0.45
z^-1 = 34.30531733
-1 < 0
1/(z^1) = 34.30531733 // * z^1
1 = 34.30531733*z^1 // : 34.30531733
0.02915 = z^1
z = 0.02915
z = 0.02915
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