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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
12.28/2.6 = 5.2/n // - 5.2/n
12.28/2.6-(5.2/n) = 0
12.28/2.6-5.2*n^-1 = 0
-5.2*n^-1 = -4.72307692 // : -5.2
n^-1 = 0.90828402
-1 < 0
1/(n^1) = 0.90828402 // * n^1
1 = 0.90828402*n^1 // : 0.90828402
1.1009772 = n^1
n = 1.1009772
n = 1.1009772
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