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D( x )
8*x-16 = 0
8*x-16 = 0
8*x-16 = 0
8*x-16 = 0 // + 16
8*x = 16 // : 8
x = 16/8
x = 2
x in (-oo:2) U (2:+oo)
(4*x-8)/(8*x-16) = 0
4*x-8 = 0 // + 8
4*x = 8 // : 4
x = 8/4
x = 2
x in { 2}
x belongs to the empty set
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