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D( x )
x^19 = 0
x^19 = 0
x^19 = 0
1*x^19 = 0 // : 1
x^19 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^11)/(x^19) = 0
1*x^-8 = 0 // : 1
x^-8 = 0
x naleu017Cy do O
x belongs to the empty set
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