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