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D( n )
n-1 = 0
n-1 = 0
n-1 = 0
n-1 = 0 // + 1
n = 1
n in (-oo:1) U (1:+oo)
(2*n-5)/(n-1) = 0
2*n-5 = 0 // + 5
2*n = 5 // : 2
n = 5/2
n = 5/2
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