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D( x )
-x = 0
-x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 2*x-(5/(-x))-1 // - 2*x-(5/(-x))-1
5/(-x)-(2*x)+y+1 = 0
5/(-x)-2*x+y+1 = 0
1*x^0-2*x^1-5*x^-1 = 0
(1*x^1-2*x^2-5*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^1-2*x^2-5*x^0) = 0
x^1
x-2*x^2-5 = 0
x-2*x^2-5 = 0
DELTA = 1^2-(-5*(-2)*4)
DELTA = -39
DELTA < 0
x in { }
x belongs to the empty set
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