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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
6/z = 5/3 // - 5/3
6/z-(5/3) = 0
6/z-5/3 = 0
6*z^-1 = 5/3 // : 6
z^-1 = 5/18
-1 < 0
1/(z^1) = 5/18 // * z^1
1 = 5/18*z^1 // : 5/18
18/5 = z^1
z = 18/5
z = 18/5
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