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x in (-oo:+oo)
(5/6)*x^8 = x // - x
(5/6)*x^8-x = 0
5/6*x^8-x = 0
x*(5/6*x^7-1) = 0
5/6*x^7 = 1 // : 5/6
x^7 = 6/5
x^7 = 6/5 // ^ 1/7
x = (6/5)^(1/7)
x = 0
x = 0
x in { (6/5)^(1/7), 0 }
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