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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
32/13 = 192/n // - 192/n
32/13-(192/n) = 0
32/13-192*n^-1 = 0
-192*n^-1 = -32/13 // : -192
n^-1 = 1/78
-1 < 0
1/(n^1) = 1/78 // * n^1
1 = 1/78*n^1 // : 1/78
78 = n^1
n = 78
n = 78
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