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X in (-oo:+oo)
X^2 = 49/12 // - 49/12
X^2-(49/12) = 0
X^2-49/12 = 0
1*X^2 = 49/12 // : 1
X^2 = 49/12
X^2 = 49/12 // ^ 1/2
abs(X) = (49/12)^(1/2)
X = (49/12)^(1/2) or X = -(49/12)^(1/2)
X in { (49/12)^(1/2), -(49/12)^(1/2) }
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