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8/3 = x^12 // - x^12
8/3-x^12 = 0
-1*x^12 = -8/3 // : -1
x^12 = 8/3
x^12 = 8/3 // ^ 1/12
abs(x) = (8/3)^(1/12)
x = (8/3)^(1/12) or x = -(8/3)^(1/12)
x in { (8/3)^(1/12), -(8/3)^(1/12) }
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