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X in (-oo:+oo)
(X^2)/5 = 3/20 // - 3/20
(X^2)/5-(3/20) = 0
(X^2)/5-3/20 = 0
1/5*X^2 = 3/20 // : 1/5
X^2 = 3/4
X^2 = 3/4 // ^ 1/2
abs(X) = (3/4)^(1/2)
X = (3/4)^(1/2) or X = -(3/4)^(1/2)
X in { (3/4)^(1/2), -(3/4)^(1/2) }
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