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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = 2/7 // - 2/7
6/n-(2/7) = 0
6/n-2/7 = 0
6*n^-1 = 2/7 // : 6
n^-1 = 1/21
-1 < 0
1/(n^1) = 1/21 // * n^1
1 = 1/21*n^1 // : 1/21
21 = n^1
n = 21
n = 21
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