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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/3-(4/x) = 5/3 // - 5/3
(2*x)/3-(4/x)-(5/3) = 0
(2*x)/3-4*x^-1-5/3 = 0
2/3*x^1-4*x^-1-5/3*x^0 = 0
(2/3*x^2-5/3*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(2/3*x^2-5/3*x^1-4*x^0) = 0
x^1
(2/3)*x^2+(-5/3)*x-4 = 0
(2/3)*x^2+(-5/3)*x-4 = 0
DELTA = (-5/3)^2-(-4*4*(2/3))
DELTA = 121/9
DELTA > 0
x = ((121/9)^(1/2)-(-5/3))/(2*(2/3)) or x = (-(-5/3)-(121/9)^(1/2))/(2*(2/3))
x = 4 or x = -3/2
x in { -3/2, 4}
x in { -3/2, 4 }
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