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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
(5*n)/n+3 = n-8 // - n-8
(5*n)/n-n+3+8 = 0
16-n = 0 // - 16
-n = -16 // * -1
n = 16
n = 16
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