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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
(13/3)*X-6 = 5/X-1 // - 5/X-1
(13/3)*X-(5/X)-6+1 = 0
(13/3)*X-5*X^-1-6+1 = 0
13/3*X^1-5*X^-1-5*X^0 = 0
(13/3*X^2-5*X^1-5*X^0)/(X^1) = 0 // * X^2
X^1*(13/3*X^2-5*X^1-5*X^0) = 0
X^1
(13/3)*X^2-5*X-5 = 0
(13/3)*X^2-5*X-5 = 0
DELTA = (-5)^2-(-5*4*(13/3))
DELTA = 335/3
DELTA > 0
X = ((335/3)^(1/2)+5)/(2*(13/3)) or X = (5-(335/3)^(1/2))/(2*(13/3))
X = 3/26*((335/3)^(1/2)+5) or X = 3/26*(5-(335/3)^(1/2))
X in { 3/26*(5-(335/3)^(1/2)), 3/26*((335/3)^(1/2)+5)}
X in { 3/26*(5-(335/3)^(1/2)), 3/26*((335/3)^(1/2)+5) }
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