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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
7/z+7+7 = 8 // - 8
7/z-8+7+7 = 0
7*z^-1 = -6 // : 7
z^-1 = -6/7
-1 < 0
1/(z^1) = -6/7 // * z^1
1 = -6/7*z^1 // : -6/7
-7/6 = z^1
z = -7/6
z = -7/6
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