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x in (-oo:+oo)
x^(2/3) = 16 // - 16
x^(2/3)-16 = 0
1*x^(2/3) = 16 // : 1
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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