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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7/3 = 2/n // - 2/n
7/3-(2/n) = 0
7/3-2*n^-1 = 0
-2*n^-1 = -7/3 // : -2
n^-1 = 7/6
-1 < 0
1/(n^1) = 7/6 // * n^1
1 = 7/6*n^1 // : 7/6
6/7 = n^1
n = 6/7
n = 6/7
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