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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(6/3)*x+4/x-1+1 = (13/3)*x+1 // - (13/3)*x+1
(6/3)*x-((13/3)*x)+4/x-1-1+1 = 0
(6/3)*x+(-13/3)*x+4/x-1-1+1 = 0
4*x^-1-7/3*x^1-1*x^0 = 0
(4*x^0-7/3*x^2-1*x^1)/(x^1) = 0 // * x^2
x^1*(4*x^0-7/3*x^2-1*x^1) = 0
x^1
(-7/3)*x^2-x+4 = 0
(-7/3)*x^2-x+4 = 0
DELTA = (-1)^2-(4*4*(-7/3))
DELTA = 115/3
DELTA > 0
x = ((115/3)^(1/2)+1)/(2*(-7/3)) or x = (1-(115/3)^(1/2))/(2*(-7/3))
x = -3/14*((115/3)^(1/2)+1) or x = -3/14*(1-(115/3)^(1/2))
x in { -3/14*((115/3)^(1/2)+1), -3/14*(1-(115/3)^(1/2))}
x in { -3/14*((115/3)^(1/2)+1), -3/14*(1-(115/3)^(1/2)) }
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