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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
4/11 = 18/z // - 18/z
4/11-(18/z) = 0
4/11-18*z^-1 = 0
-18*z^-1 = -4/11 // : -18
z^-1 = 2/99
-1 < 0
1/(z^1) = 2/99 // * z^1
1 = 2/99*z^1 // : 2/99
99/2 = z^1
z = 99/2
z = 99/2
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