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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
77/360 = 92/n // - 92/n
77/360-(92/n) = 0
77/360-92*n^-1 = 0
-92*n^-1 = -77/360 // : -92
n^-1 = 77/33120
-1 < 0
1/(n^1) = 77/33120 // * n^1
1 = 77/33120*n^1 // : 77/33120
33120/77 = n^1
n = 33120/77
n = 33120/77
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