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