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X in (-oo:+oo)
X^2-(2/12) = 0
X^2-1/6 = 0
1*X^2 = 1/6 // : 1
X^2 = 1/6
X^2 = 1/6 // ^ 1/2
abs(X) = (1/6)^(1/2)
X = (1/6)^(1/2) or X = -(1/6)^(1/2)
X in { (1/6)^(1/2), -(1/6)^(1/2) }
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