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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
2/z-5 = 0
2*z^-1 = 5 // : 2
z^-1 = 5/2
-1 < 0
1/(z^1) = 5/2 // * z^1
1 = 5/2*z^1 // : 5/2
2/5 = z^1
z = 2/5
z = 2/5
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