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