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x in (-oo:+oo)
(1/6)*x^2-4 = 5/6 // - 5/6
(1/6)*x^2-(5/6)-4 = 0
(1/6)*x^2-5/6-4 = 0
1/6*x^2 = 29/6 // : 1/6
x^2 = 29
x^2 = 29 // ^ 1/2
abs(x) = 29^(1/2)
x = 29^(1/2) or x = -29^(1/2)
x in { 29^(1/2), -29^(1/2) }
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