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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
4/z = 32 // - 32
4/z-32 = 0
4*z^-1 = 32 // : 4
z^-1 = 8
-1 < 0
1/(z^1) = 8 // * z^1
1 = 8*z^1 // : 8
1/8 = z^1
z = 1/8
z = 1/8
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