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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n = 2.7 // - 2.7
3/n-2.7 = 0
3*n^-1 = 2.7 // : 3
n^-1 = 0.9
-1 < 0
1/(n^1) = 0.9 // * n^1
1 = 0.9*n^1 // : 0.9
1.11111111 = n^1
n = 1.11111111
n = 1.11111111
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