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