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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(25*x+x^(1/5))/x = 0
25*x+x^(1/5) = 0
x^(1/5)*(25*x^(4/5)+1) = 0
25*x^(4/5) = -1 // : 25
x^(4/5) = -1/25
( -1/25 < 0 i 4/5 in (0:1) ) => x naleu017Cy do O
x^(1/5) = 0
(x^(1/5))/x = 0
1*x^(1/5) = 0 // : 1
x^(1/5) = 0
x = 0
x in { 0}
x belongs to the empty set
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