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8-x^16-(1/3) = 0
8-x^16-1/3 = 0
-1*x^16 = -23/3 // : -1
x^16 = 23/3
x^16 = 23/3 // ^ 1/16
abs(x) = (23/3)^(1/16)
x = (23/3)^(1/16) or x = -(23/3)^(1/16)
x in { (23/3)^(1/16), -(23/3)^(1/16) }
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