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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n = 1/16 // - 1/16
3/n-(1/16) = 0
3/n-1/16 = 0
3*n^-1 = 1/16 // : 3
n^-1 = 1/48
-1 < 0
1/(n^1) = 1/48 // * n^1
1 = 1/48*n^1 // : 1/48
48 = n^1
n = 48
n = 48
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