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