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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-1)/3+(x^-2)/3-56+0 = 0
(x^-1)/3+(x^-2)/3-56 = 0
1/3*x^-1+1/3*x^-2-56 = 0
t_1 = x^-1
1/3*t_1^2+1/3*t_1^1-56 = 0
1/3*t_1^2+1/3*t_1-56 = 0
DELTA = (1/3)^2-(-56*1/3*4)
DELTA = 673/9
DELTA > 0
t_1 = ((673/9)^(1/2)-1/3)/(1/3*2) or t_1 = (-(673/9)^(1/2)-1/3)/(1/3*2)
t_1 = 3/2*((673/9)^(1/2)-1/3) or t_1 = -3/2*((673/9)^(1/2)+1/3)
t_1 = -3/2*((673/9)^(1/2)+1/3)
x^-1-(-3/2*((673/9)^(1/2)+1/3)) = 0
x^-1+3/2*((673/9)^(1/2)+1/3) = 0
1*x^-1 = -(3/2*((673/9)^(1/2)+1/3)) // : 1
x^-1 = -3/2*((673/9)^(1/2)+1/3)
-1 < 0
1/(x^1) = -3/2*((673/9)^(1/2)+1/3) // * x^1
1 = -3/2*((673/9)^(1/2)+1/3)*x^1 // : -3/2*((673/9)^(1/2)+1/3)
-2/3*((673/9)^(1/2)+1/3)^-1 = x^1
x = -2/3*((673/9)^(1/2)+1/3)^-1
t_1 = 3/2*((673/9)^(1/2)-1/3)
x^-1-(3/2*((673/9)^(1/2)-1/3)) = 0
x^-1-3/2*((673/9)^(1/2)-1/3) = 0
1*x^-1 = -(-3/2*((673/9)^(1/2)-1/3)) // : 1
x^-1 = 3/2*((673/9)^(1/2)-1/3)
-1 < 0
1/(x^1) = 3/2*((673/9)^(1/2)-1/3) // * x^1
1 = 3/2*((673/9)^(1/2)-1/3)*x^1 // : 3/2*((673/9)^(1/2)-1/3)
2/3*((673/9)^(1/2)-1/3)^-1 = x^1
x = 2/3*((673/9)^(1/2)-1/3)^-1
x in { -2/3*((673/9)^(1/2)+1/3)^-1, 2/3*((673/9)^(1/2)-1/3)^-1 }
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