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X in (-oo:+oo)
(X^2)/3 = 75 // - 75
(X^2)/3-75 = 0
1/3*X^2 = 75 // : 1/3
X^2 = 225
X^2 = 225 // ^ 1/2
abs(X) = 15
X = 15 or X = -15
X in { 15, -15 }
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