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x in (-oo:+oo)
x^(4/3) = 16 // - 16
x^(4/3)-16 = 0
1*x^(4/3) = 16 // : 1
x^(4/3) = 16
x^(4/3) = 16 // ^ 3
x^4 = 4096 // ^ 1/4
abs(x) = 8
x = 8 or x = -8
x in { 8, -8 }
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