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x in (-oo:+oo)
x^(4/3) = 256 // - 256
x^(4/3)-256 = 0
1*x^(4/3) = 256 // : 1
x^(4/3) = 256
x^(4/3) = 256 // ^ 3
x^4 = 16777216 // ^ 1/4
abs(x) = 64
x = 64 or x = -64
x in { 64, -64 }
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