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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
100/n = 6 // - 6
100/n-6 = 0
100*n^-1 = 6 // : 100
n^-1 = 3/50
-1 < 0
1/(n^1) = 3/50 // * n^1
1 = 3/50*n^1 // : 3/50
50/3 = n^1
n = 50/3
n = 50/3
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