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x in (-oo:+oo)
x*(((2/3)*x^5)/9) = 3 // - 3
x*(((2/3)*x^5)/9)-3 = 0
2/27*x^6 = 3 // : 2/27
x^6 = 81/2
x^6 = 81/2 // ^ 1/6
abs(x) = (81/2)^(1/6)
x = (81/2)^(1/6) or x = -(81/2)^(1/6)
x in { (81/2)^(1/6), -(81/2)^(1/6) }
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