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D( z )

z = 0

z = 0

z = 0

z in (-oo:0) U (0:+oo)

12/z = 2 / - 2

12/z-2 = 0

12*z^-1 = 2 / : 12

z^-1 = 1/6

-1 < 0

1/(z^1) = 1/6 / * z^1

1 = 1/6*z^1 / : 1/6

6 = z^1

z = 6

z = 6

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