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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y/x = 0.5 // - 0.5
y/x-0.5 = 0
x^-1*y = 0.5 // : y
x^-1 = 0.5/y
-1 < 0
1/(x^1) = 0.5/y // * x^1
1 = x^1*(0.5/y) // : 0.5/y
2*y = x^1
x = 2*y
x = 2*y
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