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