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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/n-(-2/7) = 6 // - 6
8/n-(-2/7)-6 = 0
8/n+2/7-6 = 0
8*n^-1 = 40/7 // : 8
n^-1 = 5/7
-1 < 0
1/(n^1) = 5/7 // * n^1
1 = 5/7*n^1 // : 5/7
7/5 = n^1
n = 7/5
n = 7/5
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