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X in (-oo:+oo)
(X^2)/3 = 25 // - 25
(X^2)/3-25 = 0
1/3*X^2 = 25 // : 1/3
X^2 = 75
X^2 = 75 // ^ 1/2
abs(X) = 5*3^(1/2)
X = 5*3^(1/2) or X = -(5*3^(1/2))
X in { 5*3^(1/2), -(5*3^(1/2)) }
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