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x in (-oo:+oo)
(x^2)/3 = 14 // - 14
(x^2)/3-14 = 0
1/3*x^2 = 14 // : 1/3
x^2 = 42
x^2 = 42 // ^ 1/2
abs(x) = 42^(1/2)
x = 42^(1/2) or x = -42^(1/2)
x in { 42^(1/2), -42^(1/2) }
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