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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
605/12.7 = 1230/n // - 1230/n
605/12.7-(1230/n) = 0
605/12.7-1230*n^-1 = 0
-1230*n^-1 = -47.63779528 // : -1230
n^-1 = 0.03872991
-1 < 0
1/(n^1) = 0.03872991 // * n^1
1 = 0.03872991*n^1 // : 0.03872991
25.81983795 = n^1
n = 25.81983795
n = 25.81983795
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