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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7/n = 10 // - 10
7/n-10 = 0
7*n^-1 = 10 // : 7
n^-1 = 10/7
-1 < 0
1/(n^1) = 10/7 // * n^1
1 = 10/7*n^1 // : 10/7
7/10 = n^1
n = 7/10
n = 7/10
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