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(8*x^4)/3-12 = 0
8/3*x^4 = 12 // : 8/3
x^4 = 9/2
x^4 = 9/2 // ^ 1/4
abs(x) = (9/2)^(1/4)
x = (9/2)^(1/4) or x = -(9/2)^(1/4)
x in { (9/2)^(1/4), -(9/2)^(1/4) }
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