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(20/7)*x^14 = n // - n
(20/7)*x^14-n = 0
20/7*x^14 = n // : 20/7
x^14 = 7/20*n
x^14 = 7/20*n // ^ 1/14
abs(x) = (7/20)^(1/14)*n^(1/14)
x = (7/20)^(1/14)*n^(1/14) or x = -((7/20)^(1/14)*n^(1/14))
x in { (7/20)^(1/14)*n^(1/14), -((7/20)^(1/14)*n^(1/14)) }
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