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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
27/5 = 3/z // - 3/z
27/5-(3/z) = 0
27/5-3*z^-1 = 0
-3*z^-1 = -27/5 // : -3
z^-1 = 9/5
-1 < 0
1/(z^1) = 9/5 // * z^1
1 = 9/5*z^1 // : 9/5
5/9 = z^1
z = 5/9
z = 5/9
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