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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x)/x-(2*x^2)-(4/9) = 0
(3*x)/x-2*x^2-4/9 = 0
-2*x^2 = -23/9 // : -2
x^2 = 23/18
x^2 = 23/18 // ^ 1/2
abs(x) = (23/18)^(1/2)
x = (23/18)^(1/2) or x = -(23/18)^(1/2)
x in { (23/18)^(1/2), -(23/18)^(1/2) }
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