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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
3/z = 2/5 // - 2/5
3/z-(2/5) = 0
3/z-2/5 = 0
3*z^-1 = 2/5 // : 3
z^-1 = 2/15
-1 < 0
1/(z^1) = 2/15 // * z^1
1 = 2/15*z^1 // : 2/15
15/2 = z^1
z = 15/2
z = 15/2
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