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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
15.577/n = 12.3 // - 12.3
15.577/n-12.3 = 0
15.577*n^-1 = 12.3 // : 15.577
n^-1 = 0.78962573
-1 < 0
1/(n^1) = 0.78962573 // * n^1
1 = 0.78962573*n^1 // : 0.78962573
1.26642276 = n^1
n = 1.26642276
n = 1.26642276
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