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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/77 = 92/n // - 92/n
6/77-(92/n) = 0
6/77-92*n^-1 = 0
-92*n^-1 = -6/77 // : -92
n^-1 = 3/3542
-1 < 0
1/(n^1) = 3/3542 // * n^1
1 = 3/3542*n^1 // : 3/3542
3542/3 = n^1
n = 3542/3
n = 3542/3
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