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X in (-oo:+oo)
(X^2)/3-(9/49) = 0
(X^2)/3-9/49 = 0
1/3*X^2 = 9/49 // : 1/3
X^2 = 27/49
X^2 = 27/49 // ^ 1/2
abs(X) = (27/49)^(1/2)
X = (27/49)^(1/2) or X = -(27/49)^(1/2)
X in { (27/49)^(1/2), -(27/49)^(1/2) }
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