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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
15/9 = 8/z // - 8/z
15/9-(8/z) = 0
15/9-8*z^-1 = 0
-8*z^-1 = -5/3 // : -8
z^-1 = 5/24
-1 < 0
1/(z^1) = 5/24 // * z^1
1 = 5/24*z^1 // : 5/24
24/5 = z^1
z = 24/5
z = 24/5
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