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D( x )
x-5 = 0
x-2 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:5) U (5:+oo)
(9/(x-2))*(7/(x-5)) = 0
(7*9)/((x-2)*(x-5)) = 0
x belongs to the empty set
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