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D( n )
2*n-5 = 0
2*n-5 = 0
2*n-5 = 0
2*n-5 = 0 // + 5
2*n = 5 // : 2
n = 5/2
n in (-oo:5/2) U (5/2:+oo)
(n+8)/(2*n-5) = 0
n+8 = 0 // - 8
n = -8
n = -8
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