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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
56/64 = 7/n // - 7/n
56/64-(7/n) = 0
56/64-7*n^-1 = 0
-7*n^-1 = -7/8 // : -7
n^-1 = 1/8
-1 < 0
1/(n^1) = 1/8 // * n^1
1 = 1/8*n^1 // : 1/8
8 = n^1
n = 8
n = 8
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