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x in (-oo:+oo)
(1/3)*((x^2)/3) = 1/9 // - 1/9
(1/3)*((x^2)/3)-(1/9) = 0
(1/3)*((x^2)/3)-1/9 = 0
1/9*x^2 = 1/9 // : 1/9
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
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