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x in (-oo:+oo)
(1/3)*x^16 = 11 // - 11
(1/3)*x^16-11 = 0
1/3*x^16 = 11 // : 1/3
x^16 = 33
x^16 = 33 // ^ 1/16
abs(x) = 33^(1/16)
x = 33^(1/16) or x = -33^(1/16)
x in { 33^(1/16), -33^(1/16) }
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