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X in (-oo:+oo)
3*X^(2/3) = 48 // - 48
3*X^(2/3)-48 = 0
3*X^(2/3) = 48 // : 3
X^(2/3) = 16
X^(2/3) = 16 // ^ 3
X^2 = 4096 // ^ 1/2
abs(X) = 64
X = 64 or X = -64
X in { 64, -64 }
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