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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(5/x)+6 = x+1/x+4 // - x+1/x+4
X-x-(5/x)-(1/x)-4+6 = 0
X-x-5*x^-1-x^-1-4+6 = 0
2*x^0-1*x^1-6*x^-1 = 0
(2*x^1-1*x^2-6*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^1-1*x^2-6*x^0) = 0
x^1
2*x-x^2-6 = 0
2*x-x^2-6 = 0
DELTA = 2^2-(-6*(-1)*4)
DELTA = -20
DELTA < 0
x in { }
x belongs to the empty set
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