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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(X-(y/x)+y)^2 = 0
(X-(x^-1*y)+y)^2 = 0
x^-1*(-y) = -(X+y) // : -y
x^-1 = (X+y)/y
-1 < 0
1/(x^1) = (X+y)/y // * x^1
1 = x^1*((X+y)/y) // : (X+y)/y
1/((X+y)/y) = x^1
x = 1/((X+y)/y)
x in { 1/((X+y)/y), 1/((X+y)/y) }
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