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D( w )
w+6 = 0
w+6 = 0
w+6 = 0
w+6 = 0 // - 6
w = -6
w in (-oo:-6) U (-6:+oo)
(w-10)/(w+6) = 0
w-10 = 0 // + 10
w = 10
w = 10
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