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x in (-oo:+oo)
x^2 = 15/81 // - 15/81
x^2-(15/81) = 0
x^2-5/27 = 0
1*x^2 = 5/27 // : 1
x^2 = 5/27
x^2 = 5/27 // ^ 1/2
abs(x) = (5/27)^(1/2)
x = (5/27)^(1/2) or x = -(5/27)^(1/2)
x in { (5/27)^(1/2), -(5/27)^(1/2) }
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