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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
36/z = 16/7 // - 16/7
36/z-(16/7) = 0
36/z-16/7 = 0
36*z^-1 = 16/7 // : 36
z^-1 = 4/63
-1 < 0
1/(z^1) = 4/63 // * z^1
1 = 4/63*z^1 // : 4/63
63/4 = z^1
z = 63/4
z = 63/4
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