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x in (-oo:+oo)
(1/3)*x^2 = 38 // - 38
(1/3)*x^2-38 = 0
1/3*x^2 = 38 // : 1/3
x^2 = 114
x^2 = 114 // ^ 1/2
abs(x) = 114^(1/2)
x = 114^(1/2) or x = -114^(1/2)
x in { 114^(1/2), -114^(1/2) }
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