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x in (-oo:+oo)
(4/9)*x^2 = 5/6 // - 5/6
(4/9)*x^2-(5/6) = 0
(4/9)*x^2-5/6 = 0
4/9*x^2 = 5/6 // : 4/9
x^2 = 15/8
x^2 = 15/8 // ^ 1/2
abs(x) = (15/8)^(1/2)
x = (15/8)^(1/2) or x = -(15/8)^(1/2)
x in { (15/8)^(1/2), -(15/8)^(1/2) }
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