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x in (-oo:+oo)
(27/25)*x^2 = 1/3 // - 1/3
(27/25)*x^2-(1/3) = 0
(27/25)*x^2-1/3 = 0
27/25*x^2 = 1/3 // : 27/25
x^2 = 25/81
x^2 = 25/81 // ^ 1/2
abs(x) = 5/9
x = 5/9 or x = -5/9
x in { 5/9, -5/9 }
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