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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
15.3/n = 3 // - 3
15.3/n-3 = 0
15.3*n^-1 = 3 // : 15.3
n^-1 = 0.19607843
-1 < 0
1/(n^1) = 0.19607843 // * n^1
1 = 0.19607843*n^1 // : 0.19607843
5.10000004 = n^1
n = 5.10000004
n = 5.10000004
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