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23*x^4-(38/2) = 0
23*x^4-19 = 0
23*x^4 = 19 // : 23
x^4 = 19/23
x^4 = 19/23 // ^ 1/4
abs(x) = (19/23)^(1/4)
x = (19/23)^(1/4) or x = -(19/23)^(1/4)
x in { (19/23)^(1/4), -(19/23)^(1/4) }
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