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x in (-oo:+oo)
x^2 = 8/125 // - 8/125
x^2-(8/125) = 0
x^2-8/125 = 0
1*x^2 = 8/125 // : 1
x^2 = 8/125
x^2 = 8/125 // ^ 1/2
abs(x) = (8/125)^(1/2)
x = (8/125)^(1/2) or x = -(8/125)^(1/2)
x in { (8/125)^(1/2), -(8/125)^(1/2) }
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