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