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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-(1/3) = x/6 // - x/6
4/x-(x/6)-(1/3) = 0
4/x-(x/6)-1/3 = 0
4*x^-1-1/6*x^1-1/3*x^0 = 0
(4*x^0-1/6*x^2-1/3*x^1)/(x^1) = 0 // * x^2
x^1*(4*x^0-1/6*x^2-1/3*x^1) = 0
x^1
(-1/6)*x^2+(-1/3)*x+4 = 0
(-1/6)*x^2+(-1/3)*x+4 = 0
DELTA = (-1/3)^2-(4*4*(-1/6))
DELTA = 25/9
DELTA > 0
x = ((25/9)^(1/2)-(-1/3))/(2*(-1/6)) or x = (-(-1/3)-(25/9)^(1/2))/(2*(-1/6))
x = -6 or x = 4
x in { -6, 4}
x in { -6, 4 }
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