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5*x^20*(x^25-((1/5)*x)) = 0
5*x^20*(x^25+(-1/5)*x) = 0
5*x^20*(x^25-1/5*x) = 0
x^25-1/5*x = 0
x*(x^24-1/5) = 0
1*x^24 = 1/5 // : 1
x^24 = 1/5
x^24 = 1/5 // ^ 1/24
abs(x) = (1/5)^(1/24)
x = (1/5)^(1/24) or x = -(1/5)^(1/24)
x*(x-(1/5)^(1/24))*(x+(1/5)^(1/24)) = 0
5*x*x^20*(x-(1/5)^(1/24))*(x+(1/5)^(1/24)) = 0
( 5*x^20 )
5*x^20 = 0 // : 5
x^20 = 0
x = 0
( x+(1/5)^(1/24) )
x+(1/5)^(1/24) = 0 // - (1/5)^(1/24)
x = -(1/5)^(1/24)
( x-(1/5)^(1/24) )
x-(1/5)^(1/24) = 0 // + (1/5)^(1/24)
x = (1/5)^(1/24)
( x )
x = 0
x in { 0, -(1/5)^(1/24), (1/5)^(1/24), 0 }
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