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x in (-oo:+oo)
(1/5)*x^2-2 = 5/6 // - 5/6
(1/5)*x^2-(5/6)-2 = 0
(1/5)*x^2-5/6-2 = 0
1/5*x^2 = 17/6 // : 1/5
x^2 = 85/6
x^2 = 85/6 // ^ 1/2
abs(x) = (85/6)^(1/2)
x = (85/6)^(1/2) or x = -(85/6)^(1/2)
x in { (85/6)^(1/2), -(85/6)^(1/2) }
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