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X in (-oo:+oo)
2*X*(X/3) = 864 // - 864
2*X*(X/3)-864 = 0
2/3*X^2 = 864 // : 2/3
X^2 = 1296
X^2 = 1296 // ^ 1/2
abs(X) = 36
X = 36 or X = -36
X in { 36, -36 }
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