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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
46.8/n = 117 // - 117
46.8/n-117 = 0
46.8*n^-1 = 117 // : 46.8
n^-1 = 2.5
-1 < 0
1/(n^1) = 2.5 // * n^1
1 = 2.5*n^1 // : 2.5
0.4 = n^1
n = 0.4
n = 0.4
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