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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/n = 45 // - 45
5/n-45 = 0
5*n^-1 = 45 // : 5
n^-1 = 9
-1 < 0
1/(n^1) = 9 // * n^1
1 = 9*n^1 // : 9
1/9 = n^1
n = 1/9
n = 1/9
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