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