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(3/8)*x^4-1 = 0
3/8*x^4 = 1 // : 3/8
x^4 = 8/3
x^4 = 8/3 // ^ 1/4
abs(x) = (8/3)^(1/4)
x = (8/3)^(1/4) or x = -(8/3)^(1/4)
x in { (8/3)^(1/4), -(8/3)^(1/4) }
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