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D( x )
5*x-1 = 0
5*x-1 = 0
5*x-1 = 0
5*x-1 = 0 // + 1
5*x = 1 // : 5
x = 1/5
x in (-oo:1/5) U (1/5:+oo)
(25*x^3-x)/(5*x-1) = 0
25*x^3-x = 0
x*(25*x^2-1) = 0
25*x^2 = 1 // : 25
x^2 = 1/25
x^2 = 1/25 // ^ 1/2
abs(x) = 1/5
x = 1/5 or x = -1/5
x*(x-1/5)*(x+1/5) = 0
(x*(x-1/5)*(x+1/5))/(5*x-1) = 0
( x+1/5 )
x+1/5 = 0 // - 1/5
x = -1/5
( x-1/5 )
x-1/5 = 0 // + 1/5
x = 1/5
( x )
x = 0
x in { 1/5}
x in { -1/5, 0 }
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