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X in (-oo:+oo)
(X^2)/(-3) = -12 // + 12
(X^2)/(-3)+12 = 0
-1/3*X^2 = -12 // : -1/3
X^2 = 36
X^2 = 36 // ^ 1/2
abs(X) = 6
X = 6 or X = -6
X in { 6, -6 }
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