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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1.7/n = 2.1/17 // - 2.1/17
1.7/n-(2.1/17) = 0
1.7/n-0.12352941 = 0
1.7*n^-1 = 0.12352941 // : 1.7
n^-1 = 0.07266436
-1 < 0
1/(n^1) = 0.07266436 // * n^1
1 = 0.07266436*n^1 // : 0.07266436
13.76190474 = n^1
n = 13.76190474
n = 13.76190474
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