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