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(1/6)*x^4 = n // - n
(1/6)*x^4-n = 0
1/6*x^4 = n // : 1/6
x^4 = 6*n
x^4 = 6*n // ^ 1/4
abs(x) = 6^(1/4)*n^(1/4)
x = 6^(1/4)*n^(1/4) or x = -(6^(1/4)*n^(1/4))
x in { 6^(1/4)*n^(1/4), -(6^(1/4)*n^(1/4)) }
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