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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/3)*x-(1/6) = 5/x-(2/3) // - 5/x-(2/3)
(2/3)*x-(5/x)-(1/6)+2/3 = 0
(2/3)*x-5*x^-1-1/6+2/3 = 0
2/3*x^1-5*x^-1+1/2*x^0 = 0
(2/3*x^2+1/2*x^1-5*x^0)/(x^1) = 0 // * x^2
x^1*(2/3*x^2+1/2*x^1-5*x^0) = 0
x^1
(2/3)*x^2+(1/2)*x-5 = 0
(2/3)*x^2+(1/2)*x-5 = 0
DELTA = (1/2)^2-(-5*4*(2/3))
DELTA = 163/12
DELTA > 0
x = ((163/12)^(1/2)-(1/2))/(2*(2/3)) or x = (-(1/2)-(163/12)^(1/2))/(2*(2/3))
x = 3/4*((163/12)^(1/2)-1/2) or x = -3/4*((163/12)^(1/2)+1/2)
x in { -3/4*((163/12)^(1/2)+1/2), 3/4*((163/12)^(1/2)-1/2)}
x in { -3/4*((163/12)^(1/2)+1/2), 3/4*((163/12)^(1/2)-1/2) }
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