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x in (-oo:+oo)
(x^2)/3 = 1/729 // - 1/729
(x^2)/3-(1/729) = 0
(x^2)/3-1/729 = 0
1/3*x^2 = 1/729 // : 1/3
x^2 = 1/243
x^2 = 1/243 // ^ 1/2
abs(x) = (1/243)^(1/2)
x = (1/243)^(1/2) or x = -(1/243)^(1/2)
x in { (1/243)^(1/2), -(1/243)^(1/2) }
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