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8-((11/20)*x^10) = 0
(-11/20)*x^10+8 = 0
-11/20*x^10 = -8 // : -11/20
x^10 = 160/11
x^10 = 160/11 // ^ 1/10
abs(x) = (160/11)^(1/10)
x = (160/11)^(1/10) or x = -(160/11)^(1/10)
x in { (160/11)^(1/10), -(160/11)^(1/10) }
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