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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
9/z = 18/36 // - 18/36
9/z-(18/36) = 0
9/z-1/2 = 0
9*z^-1 = 1/2 // : 9
z^-1 = 1/18
-1 < 0
1/(z^1) = 1/18 // * z^1
1 = 1/18*z^1 // : 1/18
18 = z^1
z = 18
z = 18
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