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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
135/z-8 = 44 // - 44
135/z-44-8 = 0
135*z^-1 = 52 // : 135
z^-1 = 52/135
-1 < 0
1/(z^1) = 52/135 // * z^1
1 = 52/135*z^1 // : 52/135
135/52 = z^1
z = 135/52
z = 135/52
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