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D( n )
n-5 = 0
n-5 = 0
n-5 = 0
n-5 = 0 // + 5
n = 5
n in (-oo:5) U (5:+oo)
(n+9)/(n-5) = 0
n+9 = 0 // - 9
n = -9
n = -9
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