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x in (-oo:+oo)
5*x^2 = 153/2 // - 153/2
5*x^2-(153/2) = 0
5*x^2-153/2 = 0
5*x^2 = 153/2 // : 5
x^2 = 153/10
x^2 = 153/10 // ^ 1/2
abs(x) = (153/10)^(1/2)
x = (153/10)^(1/2) or x = -(153/10)^(1/2)
x in { (153/10)^(1/2), -(153/10)^(1/2) }
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