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X in (-oo:+oo)
(3*X^2)/3 = 48 // - 48
(3*X^2)/3-48 = 0
1*X^2 = 48 // : 1
X^2 = 48
X^2 = 48 // ^ 1/2
abs(X) = 4*3^(1/2)
X = 4*3^(1/2) or X = -(4*3^(1/2))
X in { 4*3^(1/2), -(4*3^(1/2)) }
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