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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(x/6)-(2/3) = 0
1/x-(x/6)-2/3 = 0
1*x^-1-1/6*x^1-2/3*x^0 = 0
(1*x^0-1/6*x^2-2/3*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-1/6*x^2-2/3*x^1) = 0
x^1
(-1/6)*x^2+(-2/3)*x+1 = 0
(-1/6)*x^2+(-2/3)*x+1 = 0
DELTA = (-2/3)^2-(1*4*(-1/6))
DELTA = 10/9
DELTA > 0
x = ((10/9)^(1/2)-(-2/3))/(2*(-1/6)) or x = (-(-2/3)-(10/9)^(1/2))/(2*(-1/6))
x = -3*((10/9)^(1/2)+2/3) or x = -3*(2/3-(10/9)^(1/2))
x in { -3*((10/9)^(1/2)+2/3), -3*(2/3-(10/9)^(1/2))}
x in { -3*((10/9)^(1/2)+2/3), -3*(2/3-(10/9)^(1/2)) }
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