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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
4/9 = 24/z // - 24/z
4/9-(24/z) = 0
4/9-24*z^-1 = 0
-24*z^-1 = -4/9 // : -24
z^-1 = 1/54
-1 < 0
1/(z^1) = 1/54 // * z^1
1 = 1/54*z^1 // : 1/54
54 = z^1
z = 54
z = 54
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