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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7/n-3 = 8 // - 8
7/n-8-3 = 0
7*n^-1 = 11 // : 7
n^-1 = 11/7
-1 < 0
1/(n^1) = 11/7 // * n^1
1 = 11/7*n^1 // : 11/7
7/11 = n^1
n = 7/11
n = 7/11
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