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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
24/z = 3 // - 3
24/z-3 = 0
24*z^-1 = 3 // : 24
z^-1 = 1/8
-1 < 0
1/(z^1) = 1/8 // * z^1
1 = 1/8*z^1 // : 1/8
8 = z^1
z = 8
z = 8
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