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x in (-oo:+oo)
1/4 = 15*x^2 // - 15*x^2
1/4-(15*x^2) = 0
1/4-15*x^2 = 0
-15*x^2 = -1/4 // : -15
x^2 = 1/60
x^2 = 1/60 // ^ 1/2
abs(x) = (1/60)^(1/2)
x = (1/60)^(1/2) or x = -(1/60)^(1/2)
x in { (1/60)^(1/2), -(1/60)^(1/2) }
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