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X in (-oo:+oo)
(X^2)/3+13 = 17 // - 17
(X^2)/3-17+13 = 0
1/3*X^2 = 4 // : 1/3
X^2 = 12
X^2 = 12 // ^ 1/2
abs(X) = 2*3^(1/2)
X = 2*3^(1/2) or X = -(2*3^(1/2))
X in { 2*3^(1/2), -(2*3^(1/2)) }
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