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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
16/z = -8/1 // + -8/1
16/z-(-8/1) = 0
16/z+8 = 0
16*z^-1 = -8 // : 16
z^-1 = -1/2
-1 < 0
1/(z^1) = -1/2 // * z^1
1 = -1/2*z^1 // : -1/2
-2 = z^1
z = -2
z = -2
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