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