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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-5 = (-10/2)*x-1 // - (-10/2)*x-1
4/x-((-10/2)*x)-5+1 = 0
5*x+4/x-5+1 = 0
5*x^1+4*x^-1-4*x^0 = 0
(5*x^2-4*x^1+4*x^0)/(x^1) = 0 // * x^2
x^1*(5*x^2-4*x^1+4*x^0) = 0
x^1
5*x^2-4*x+4 = 0
5*x^2-4*x+4 = 0
DELTA = (-4)^2-(4*4*5)
DELTA = -64
DELTA < 0
x in { }
x belongs to the empty set
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