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