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x in (-oo:+oo)
(1/3)*x^2 = 10 // - 10
(1/3)*x^2-10 = 0
1/3*x^2 = 10 // : 1/3
x^2 = 30
x^2 = 30 // ^ 1/2
abs(x) = 30^(1/2)
x = 30^(1/2) or x = -30^(1/2)
x in { 30^(1/2), -30^(1/2) }
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