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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/6)*x = 9/x-2 // - 9/x-2
(5/6)*x-(9/x)+2 = 0
(5/6)*x-9*x^-1+2 = 0
5/6*x^1-9*x^-1+2*x^0 = 0
(5/6*x^2+2*x^1-9*x^0)/(x^1) = 0 // * x^2
x^1*(5/6*x^2+2*x^1-9*x^0) = 0
x^1
(5/6)*x^2+2*x-9 = 0
(5/6)*x^2+2*x-9 = 0
DELTA = 2^2-(-9*4*(5/6))
DELTA = 34
DELTA > 0
x = (34^(1/2)-2)/(2*(5/6)) or x = (-34^(1/2)-2)/(2*(5/6))
x = 3/5*(34^(1/2)-2) or x = -3/5*(34^(1/2)+2)
x in { -3/5*(34^(1/2)+2), 3/5*(34^(1/2)-2)}
x in { -3/5*(34^(1/2)+2), 3/5*(34^(1/2)-2) }
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