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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
16/48 = 4/n // - 4/n
16/48-(4/n) = 0
16/48-4*n^-1 = 0
-4*n^-1 = -1/3 // : -4
n^-1 = 1/12
-1 < 0
1/(n^1) = 1/12 // * n^1
1 = 1/12*n^1 // : 1/12
12 = n^1
n = 12
n = 12
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