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