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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-2 = x+5/x+1 // - x+5/x+1
x/x-x-(5/x)-2-1 = 0
x/x-x-5*x^-1-2-1 = 0
-1*x^1-5*x^-1-2*x^0 = 0
(-1*x^2-2*x^1-5*x^0)/(x^1) = 0 // * x^2
x^1*(-1*x^2-2*x^1-5*x^0) = 0
x^1
-x^2-2*x-5 = 0
-x^2-2*x-5 = 0
DELTA = (-2)^2-(-5*(-1)*4)
DELTA = -16
DELTA < 0
x in { }
x belongs to the empty set
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