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D( x )
(x^19)^2 < 0
(x^19)^2 < 0
(x^19)^2 < 0
1*x^38 < 0
1*x^38 < 0 // : 1
x^38 < 0/1
x^38 < 0
x belongs to the empty set
x in (-oo:+oo)
((x^19)^2)^(1/10) = 0
1*x^(19/5) = 0 // : 1
x^(19/5) = 0
x = 0
x = 0
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