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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y/x = 4 // - 4
y/x-4 = 0
x^-1*y = 4 // : y
x^-1 = 4/y
-1 < 0
1/(x^1) = 4/y // * x^1
1 = x^1*(4/y) // : 4/y
1/(4/y) = x^1
x = 1/(4/y)
x = 1/(4/y)
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