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D( x )
5*x-16 = 0
5*x-16 = 0
5*x-16 = 0
5*x-16 = 0 // + 16
5*x = 16 // : 5
x = 16/5
x in (-oo:16/5) U (16/5:+oo)
45/(5*x-16) = 0
x belongs to the empty set
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