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x in (-oo:+oo)
x-((1/5)*x^4) = 0
(-1/5)*x^4+x = 0
x-1/5*x^4 = 0
x*(1-1/5*x^3) = 0
-1/5*x^3 = -1 // : -1/5
x^3 = 5
x^3 = 5 // ^ 1/3
x = 5^(1/3)
x = 0
x = 0
x in { 5^(1/3), 0 }
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