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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
16/14 = 5/n // - 5/n
16/14-(5/n) = 0
16/14-5*n^-1 = 0
-5*n^-1 = -8/7 // : -5
n^-1 = 8/35
-1 < 0
1/(n^1) = 8/35 // * n^1
1 = 8/35*n^1 // : 8/35
35/8 = n^1
n = 35/8
n = 35/8
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