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x in (-oo:+oo)
3/14 = 3*x^2 // - 3*x^2
3/14-(3*x^2) = 0
3/14-3*x^2 = 0
-3*x^2 = -3/14 // : -3
x^2 = 1/14
x^2 = 1/14 // ^ 1/2
abs(x) = (1/14)^(1/2)
x = (1/14)^(1/2) or x = -(1/14)^(1/2)
x in { (1/14)^(1/2), -(1/14)^(1/2) }
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