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D( x )
x-9 = 0
x-1 = 0
x-9 = 0
x-9 = 0
x-9 = 0 // + 9
x = 9
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:9) U (9:+oo)
(5/(x-1))*(9/(x-9)) = 0
(5*9)/((x-1)*(x-9)) = 0
( 5 )
5 = 0
x belongs to the empty set
( 9 )
9 = 0
x belongs to the empty set
x belongs to the empty set
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