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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
8-(2/z) = 10 // - 10
8-(2/z)-10 = 0
8-2*z^-1-10 = 0
-2*z^-1 = 2 // : -2
z^-1 = -1
-1 < 0
1/(z^1) = -1 // * z^1
1 = -1*z^1 // : -1
-1 = z^1
z = -1
z = -1
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