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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n = 52 // - 52
3/n-52 = 0
3*n^-1 = 52 // : 3
n^-1 = 52/3
-1 < 0
1/(n^1) = 52/3 // * n^1
1 = 52/3*n^1 // : 52/3
3/52 = n^1
n = 3/52
n = 3/52
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