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