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n in (-oo:+oo)
n^6 = 6/9 // - 6/9
n^6-(6/9) = 0
n^6-2/3 = 0
1*n^6 = 2/3 // : 1
n^6 = 2/3
n^6 = 2/3 // ^ 1/6
abs(n) = (2/3)^(1/6)
n = (2/3)^(1/6) or n = -(2/3)^(1/6)
n in { (2/3)^(1/6), -(2/3)^(1/6) }
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