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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7/n = 6/7 // - 6/7
7/n-(6/7) = 0
7/n-6/7 = 0
7*n^-1 = 6/7 // : 7
n^-1 = 6/49
-1 < 0
1/(n^1) = 6/49 // * n^1
1 = 6/49*n^1 // : 6/49
49/6 = n^1
n = 49/6
n = 49/6
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