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x in (-oo:+oo)
(1/3)*x^2+1 = 33 // - 33
(1/3)*x^2-33+1 = 0
1/3*x^2 = 32 // : 1/3
x^2 = 96
x^2 = 96 // ^ 1/2
abs(x) = 4*6^(1/2)
x = 4*6^(1/2) or x = -(4*6^(1/2))
x in { 4*6^(1/2), -(4*6^(1/2)) }
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