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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7/n = 24.5/56 // - 24.5/56
7/n-(24.5/56) = 0
7/n-0.4375 = 0
7*n^-1 = 0.4375 // : 7
n^-1 = 0.0625
-1 < 0
1/(n^1) = 0.0625 // * n^1
1 = 0.0625*n^1 // : 0.0625
16 = n^1
n = 16
n = 16
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