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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 > 12 // : 1/3
x^2 > 12/1/3
x^2 > 36
x^2 > 36 // ^ 1/2
abs(x) > 6
x in (-oo:-6) U (6:+oo)
x in (-oo:-6) U (6:+oo)
(-oo:-6) U (6:+oo)
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