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n in (-oo:+oo)
4/7 = n^42 // - n^42
4/7-n^42 = 0
-1*n^42 = -4/7 // : -1
n^42 = 4/7
n^42 = 4/7 // ^ 1/42
abs(n) = (4/7)^(1/42)
n = (4/7)^(1/42) or n = -(4/7)^(1/42)
n in { (4/7)^(1/42), -(4/7)^(1/42) }
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