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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/2)*y = 5/x // - 5/x
(1/2)*y-(5/x) = 0
(1/2)*y-5*x^-1 = 0
-5*x^-1 = -(1/2*y) // : -5
x^-1 = 1/10*y
-1 < 0
1/(x^1) = 1/10*y // * x^1
1 = 1/10*x^1*y // : 1/10*y
10*y^-1 = x^1
x = 10*y^-1
x = 10*y^-1
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