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n in (-oo:+oo)
12/5 = n^8 // - n^8
12/5-n^8 = 0
-1*n^8 = -12/5 // : -1
n^8 = 12/5
n^8 = 12/5 // ^ 1/8
abs(n) = (12/5)^(1/8)
n = (12/5)^(1/8) or n = -(12/5)^(1/8)
n in { (12/5)^(1/8), -(12/5)^(1/8) }
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