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