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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/3)*x-(2/x)-3+9 = 2 // - 2
(1/3)*x-(2/x)-3-2+9 = 0
(1/3)*x-2*x^-1-3-2+9 = 0
1/3*x^1-2*x^-1+4*x^0 = 0
(1/3*x^2+4*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(1/3*x^2+4*x^1-2*x^0) = 0
x^1
(1/3)*x^2+4*x-2 = 0
(1/3)*x^2+4*x-2 = 0
DELTA = 4^2-(-2*4*(1/3))
DELTA = 56/3
DELTA > 0
x = ((56/3)^(1/2)-4)/(2*(1/3)) or x = (-(56/3)^(1/2)-4)/(2*(1/3))
x = 3/2*((56/3)^(1/2)-4) or x = -3/2*((56/3)^(1/2)+4)
x in { -3/2*((56/3)^(1/2)+4), 3/2*((56/3)^(1/2)-4)}
x in { -3/2*((56/3)^(1/2)+4), 3/2*((56/3)^(1/2)-4) }
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