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