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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x^-2)/3-((13*x^-1)/3)-5 = 0
(-13/3)*x^-1+(6*x^-2)/3-5 = 0
2*x^-2-13/3*x^-1-5 = 0
t_1 = x^-1
2*t_1^2-13/3*t_1^1-5 = 0
2*t_1^2-13/3*t_1-5 = 0
DELTA = (-13/3)^2-(-5*2*4)
DELTA = 529/9
DELTA > 0
t_1 = ((529/9)^(1/2)+13/3)/(2*2) or t_1 = (13/3-(529/9)^(1/2))/(2*2)
t_1 = 3 or t_1 = -5/6
t_1 = -5/6
x^-1+5/6 = 0
1*x^-1 = -5/6 // : 1
x^-1 = -5/6
-1 < 0
1/(x^1) = -5/6 // * x^1
1 = -5/6*x^1 // : -5/6
-6/5 = x^1
x = -6/5
t_1 = 3
x^-1-3 = 0
1*x^-1 = 3 // : 1
x^-1 = 3
-1 < 0
1/(x^1) = 3 // * x^1
1 = 3*x^1 // : 3
1/3 = x^1
x = 1/3
x in { -6/5, 1/3 }
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