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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/7 = 8/n // - 8/n
6/7-(8/n) = 0
6/7-8*n^-1 = 0
-8*n^-1 = -6/7 // : -8
n^-1 = 3/28
-1 < 0
1/(n^1) = 3/28 // * n^1
1 = 3/28*n^1 // : 3/28
28/3 = n^1
n = 28/3
n = 28/3
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