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D( w )
w-8 = 0
w-8 = 0
w-8 = 0
w-8 = 0 // + 8
w = 8
w in (-oo:8) U (8:+oo)
(8-w)/(w-8) = 0
8-w = 0 // - 8
-w = -8 // * -1
w = 8
w in { 8}
w belongs to the empty set
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