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x in (-oo:+oo)
X-(8/3) = 1-x^8 // - 1-x^8
X+x^8-(8/3)-1 = 0
X+x^8-8/3-1 = 0
1*x^8 = -(X-11/3) // : 1
x^8 = 11/3-X
x^8 = 11/3-X // ^ 1/8
abs(x) = (11/3-X)^(1/8)
x = (11/3-X)^(1/8) or x = -(11/3-X)^(1/8)
x in { (11/3-X)^(1/8), -(11/3-X)^(1/8) }
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