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