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x in (-oo:+oo)
(x^2)/2-(5/6) = 12 // - 12
(x^2)/2-(5/6)-12 = 0
(x^2)/2-5/6-12 = 0
1/2*x^2 = 77/6 // : 1/2
x^2 = 77/3
x^2 = 77/3 // ^ 1/2
abs(x) = (77/3)^(1/2)
x = (77/3)^(1/2) or x = -(77/3)^(1/2)
x in { (77/3)^(1/2), -(77/3)^(1/2) }
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