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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-((1/4)*x)-(1/6) = 1/x // - 1/x
x-((1/4)*x)-(1/x)-(1/6) = 0
x+(-1/4)*x-x^-1-1/6 = 0
3/4*x^1-1*x^-1-1/6*x^0 = 0
(3/4*x^2-1/6*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(3/4*x^2-1/6*x^1-1*x^0) = 0
x^1
(3/4)*x^2+(-1/6)*x-1 = 0
(3/4)*x^2+(-1/6)*x-1 = 0
DELTA = (-1/6)^2-(-1*4*(3/4))
DELTA = 109/36
DELTA > 0
x = ((109/36)^(1/2)-(-1/6))/(2*(3/4)) or x = (-(-1/6)-(109/36)^(1/2))/(2*(3/4))
x = 2/3*((109/36)^(1/2)+1/6) or x = 2/3*(1/6-(109/36)^(1/2))
x in { 2/3*(1/6-(109/36)^(1/2)), 2/3*((109/36)^(1/2)+1/6)}
x in { 2/3*(1/6-(109/36)^(1/2)), 2/3*((109/36)^(1/2)+1/6) }
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