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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 4/x-5 // - 4/x-5
y-(4/x)+5 = 0
y-4*x^-1+5 = 0
-4*x^-1 = -(y+5) // : -4
x^-1 = (y+5)/4
-1 < 0
1/(x^1) = (y+5)/4 // * x^1
1 = x^1*((y+5)/4) // : (y+5)/4
4*(y+5)^-1 = x^1
x = 4*(y+5)^-1
x = 4*(y+5)^-1
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