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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-((1/3)*x) = 1/6 // - 1/6
1/x-((1/3)*x)-(1/6) = 0
(-1/3)*x+1/x-1/6 = 0
1*x^-1-1/3*x^1-1/6*x^0 = 0
(1*x^0-1/3*x^2-1/6*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-1/3*x^2-1/6*x^1) = 0
x^1
(-1/3)*x^2+(-1/6)*x+1 = 0
(-1/3)*x^2+(-1/6)*x+1 = 0
DELTA = (-1/6)^2-(1*4*(-1/3))
DELTA = 49/36
DELTA > 0
x = ((49/36)^(1/2)-(-1/6))/(2*(-1/3)) or x = (-(-1/6)-(49/36)^(1/2))/(2*(-1/3))
x = -2 or x = 3/2
x in { -2, 3/2}
x in { -2, 3/2 }
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