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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = 48.6 // - 48.6
6/n-48.6 = 0
6*n^-1 = 48.6 // : 6
n^-1 = 8.1
-1 < 0
1/(n^1) = 8.1 // * n^1
1 = 8.1*n^1 // : 8.1
0.12345679 = n^1
n = 0.12345679
n = 0.12345679
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