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x in (-oo:+oo)
(3/2)*x^8 = 7 // - 7
(3/2)*x^8-7 = 0
3/2*x^8 = 7 // : 3/2
x^8 = 14/3
x^8 = 14/3 // ^ 1/8
abs(x) = (14/3)^(1/8)
x = (14/3)^(1/8) or x = -(14/3)^(1/8)
x in { (14/3)^(1/8), -(14/3)^(1/8) }
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