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