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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/3)*x-1 = 1/x // - 1/x
(2/3)*x-(1/x)-1 = 0
(2/3)*x-x^-1-1 = 0
2/3*x^1-1*x^-1-1*x^0 = 0
(2/3*x^2-1*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(2/3*x^2-1*x^1-1*x^0) = 0
x^1
(2/3)*x^2-x-1 = 0
(2/3)*x^2-x-1 = 0
DELTA = (-1)^2-(-1*4*(2/3))
DELTA = 11/3
DELTA > 0
x = ((11/3)^(1/2)+1)/(2*(2/3)) or x = (1-(11/3)^(1/2))/(2*(2/3))
x = 3/4*((11/3)^(1/2)+1) or x = 3/4*(1-(11/3)^(1/2))
x in { 3/4*(1-(11/3)^(1/2)), 3/4*((11/3)^(1/2)+1)}
x in { 3/4*(1-(11/3)^(1/2)), 3/4*((11/3)^(1/2)+1) }
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