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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(1/x) = 2/3 // - 2/3
x-(1/x)-(2/3) = 0
x-x^-1-2/3 = 0
1*x^1-1*x^-1-2/3*x^0 = 0
(1*x^2-2/3*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-2/3*x^1-1*x^0) = 0
x^1
x^2+(-2/3)*x-1 = 0
x^2+(-2/3)*x-1 = 0
DELTA = (-2/3)^2-(-1*1*4)
DELTA = 40/9
DELTA > 0
x = ((40/9)^(1/2)-(-2/3))/(1*2) or x = (-(-2/3)-(40/9)^(1/2))/(1*2)
x = ((40/9)^(1/2)+2/3)/2 or x = (2/3-(40/9)^(1/2))/2
x in { (2/3-(40/9)^(1/2))/2, ((40/9)^(1/2)+2/3)/2}
x in { (2/3-(40/9)^(1/2))/2, ((40/9)^(1/2)+2/3)/2 }
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