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(5-2)*x^4-(6/3) = 0
(5-2)*x^4-2 = 0
3*x^4 = 2 // : 3
x^4 = 2/3
x^4 = 2/3 // ^ 1/4
abs(x) = (2/3)^(1/4)
x = (2/3)^(1/4) or x = -(2/3)^(1/4)
x in { (2/3)^(1/4), -(2/3)^(1/4) }
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