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x in (-oo:+oo)
(-1/7)*x-((4/(-8))*x^5) = 0
(1/2)*x^5+(-1/7)*x = 0
1/2*x^5-1/7*x = 0
x*(1/2*x^4-1/7) = 0
1/2*x^4 = 1/7 // : 1/2
x^4 = 2/7
x^4 = 2/7 // ^ 1/4
abs(x) = (2/7)^(1/4)
x = (2/7)^(1/4) or x = -(2/7)^(1/4)
x = 0
x = 0
x in { (2/7)^(1/4), -(2/7)^(1/4), 0 }
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