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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1.2/n = 2.7/19 // - 2.7/19
1.2/n-(2.7/19) = 0
1.2/n-0.14210526 = 0
1.2*n^-1 = 0.14210526 // : 1.2
n^-1 = 0.11842105
-1 < 0
1/(n^1) = 0.11842105 // * n^1
1 = 0.11842105*n^1 // : 0.11842105
8.44444463 = n^1
n = 8.44444463
n = 8.44444463
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