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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(5/x) = x-(2/3) // - x-(2/3)
2*x-x-(5/x)+2/3 = 0
2*x-x-5*x^-1+2/3 = 0
1*x^1-5*x^-1+2/3*x^0 = 0
(1*x^2+2/3*x^1-5*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+2/3*x^1-5*x^0) = 0
x^1
x^2+(2/3)*x-5 = 0
x^2+(2/3)*x-5 = 0
DELTA = (2/3)^2-(-5*1*4)
DELTA = 184/9
DELTA > 0
x = ((184/9)^(1/2)-(2/3))/(1*2) or x = (-(2/3)-(184/9)^(1/2))/(1*2)
x = ((184/9)^(1/2)-2/3)/2 or x = (-((184/9)^(1/2)+2/3))/2
x in { (-((184/9)^(1/2)+2/3))/2, ((184/9)^(1/2)-2/3)/2}
x in { (-((184/9)^(1/2)+2/3))/2, ((184/9)^(1/2)-2/3)/2 }
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