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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
3/z = 165/550 // - 165/550
3/z-(165/550) = 0
3/z-3/10 = 0
3*z^-1 = 3/10 // : 3
z^-1 = 1/10
-1 < 0
1/(z^1) = 1/10 // * z^1
1 = 1/10*z^1 // : 1/10
10 = z^1
z = 10
z = 10
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