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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
3.8/5.2 = 7.6/z // - 7.6/z
3.8/5.2-(7.6/z) = 0
3.8/5.2-7.6*z^-1 = 0
-7.6*z^-1 = -0.73076923 // : -7.6
z^-1 = 0.09615385
-1 < 0
1/(z^1) = 0.09615385 // * z^1
1 = 0.09615385*z^1 // : 0.09615385
10.39999958 = z^1
z = 10.39999958
z = 10.39999958
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