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x in (-oo:+oo)
x^2 = 9/15 // - 9/15
x^2-(9/15) = 0
x^2-3/5 = 0
1*x^2 = 3/5 // : 1
x^2 = 3/5
x^2 = 3/5 // ^ 1/2
abs(x) = (3/5)^(1/2)
x = (3/5)^(1/2) or x = -(3/5)^(1/2)
x in { (3/5)^(1/2), -(3/5)^(1/2) }
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