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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
5.8/7 = 8/z // - 8/z
5.8/7-(8/z) = 0
5.8/7-8*z^-1 = 0
-8*z^-1 = -0.82857143 // : -8
z^-1 = 0.10357143
-1 < 0
1/(z^1) = 0.10357143 // * z^1
1 = 0.10357143*z^1 // : 0.10357143
9.65517228 = z^1
z = 9.65517228
z = 9.65517228
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