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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
25/z = 0.5 // - 0.5
25/z-0.5 = 0
25*z^-1 = 0.5 // : 25
z^-1 = 0.02
-1 < 0
1/(z^1) = 0.02 // * z^1
1 = 0.02*z^1 // : 0.02
50 = z^1
z = 50
z = 50
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