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x in (-oo:+oo)
x^2 = 16/12 // - 16/12
x^2-(16/12) = 0
x^2-4/3 = 0
1*x^2 = 4/3 // : 1
x^2 = 4/3
x^2 = 4/3 // ^ 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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