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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-((1/3)*x) = 1/6 // - 1/6
2/x-((1/3)*x)-(1/6) = 0
(-1/3)*x+2/x-1/6 = 0
2*x^-1-1/3*x^1-1/6*x^0 = 0
(2*x^0-1/3*x^2-1/6*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-1/3*x^2-1/6*x^1) = 0
x^1
(-1/3)*x^2+(-1/6)*x+2 = 0
(-1/3)*x^2+(-1/6)*x+2 = 0
DELTA = (-1/6)^2-(2*4*(-1/3))
DELTA = 97/36
DELTA > 0
x = ((97/36)^(1/2)-(-1/6))/(2*(-1/3)) or x = (-(-1/6)-(97/36)^(1/2))/(2*(-1/3))
x = -3/2*((97/36)^(1/2)+1/6) or x = -3/2*(1/6-(97/36)^(1/2))
x in { -3/2*((97/36)^(1/2)+1/6), -3/2*(1/6-(97/36)^(1/2))}
x in { -3/2*((97/36)^(1/2)+1/6), -3/2*(1/6-(97/36)^(1/2)) }
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