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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+x/x = x/3+4/3 // - x/3+4/3
2/x-(x/3)+x/x-(4/3) = 0
2/x-(x/3)+x/x-4/3 = 0
2*x^-1-1/3*x^1-1/3*x^0 = 0
(2*x^0-1/3*x^2-1/3*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-1/3*x^2-1/3*x^1) = 0
x^1
(-1/3)*x^2+(-1/3)*x+2 = 0
(-1/3)*x^2+(-1/3)*x+2 = 0
DELTA = (-1/3)^2-(2*4*(-1/3))
DELTA = 25/9
DELTA > 0
x = ((25/9)^(1/2)-(-1/3))/(2*(-1/3)) or x = (-(-1/3)-(25/9)^(1/2))/(2*(-1/3))
x = -3 or x = 2
x in { -3, 2}
x in { -3, 2 }
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