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D( w )
w-3 = 0
w-3 = 0
w-3 = 0
w-3 = 0 // + 3
w = 3
w in (-oo:3) U (3:+oo)
(w-7)/(w-3) = 0
w-7 = 0 // + 7
w = 7
w = 7
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