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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7/n = 56/48 // - 56/48
7/n-(56/48) = 0
7/n-7/6 = 0
7*n^-1 = 7/6 // : 7
n^-1 = 1/6
-1 < 0
1/(n^1) = 1/6 // * n^1
1 = 1/6*n^1 // : 1/6
6 = n^1
n = 6
n = 6
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