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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2.5/23 = 5/n // - 5/n
2.5/23-(5/n) = 0
2.5/23-5*n^-1 = 0
-5*n^-1 = -0.10869565 // : -5
n^-1 = 0.02173913
-1 < 0
1/(n^1) = 0.02173913 // * n^1
1 = 0.02173913*n^1 // : 0.02173913
46.00000092 = n^1
n = 46.00000092
n = 46.00000092
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