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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
1/z = 37/407 // - 37/407
1/z-(37/407) = 0
1/z-1/11 = 0
1*z^-1 = 1/11 // : 1
z^-1 = 1/11
-1 < 0
1/(z^1) = 1/11 // * z^1
1 = 1/11*z^1 // : 1/11
11 = z^1
z = 11
z = 11
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