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D( x )
x^(1/9) = 0
x^(1/9) = 0
x^(1/9) = 0
1*x^(1/9) = 0 // : 1
x^(1/9) = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^(4/5))/(x^(1/9)) = 0
1*x^(31/45) = 0 // : 1
x^(31/45) = 0
x = 0
x in { 0}
x belongs to the empty set
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