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x in (-oo:+oo)
x^2-(1/6)-(1/6) = 0
x^2-1/6-1/6 = 0
1*x^2 = 1/3 // : 1
x^2 = 1/3
x^2 = 1/3 // ^ 1/2
abs(x) = (1/3)^(1/2)
x = (1/3)^(1/2) or x = -(1/3)^(1/2)
x in { (1/3)^(1/2), -(1/3)^(1/2) }
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