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