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X in (-oo:+oo)
X^2-(2/3) = 30 // - 30
X^2-(2/3)-30 = 0
X^2-2/3-30 = 0
1*X^2 = 92/3 // : 1
X^2 = 92/3
X^2 = 92/3 // ^ 1/2
abs(X) = (92/3)^(1/2)
X = (92/3)^(1/2) or X = -(92/3)^(1/2)
X in { (92/3)^(1/2), -(92/3)^(1/2) }
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