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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
30/n = 56/6 // - 56/6
30/n-(56/6) = 0
30/n-28/3 = 0
30*n^-1 = 28/3 // : 30
n^-1 = 14/45
-1 < 0
1/(n^1) = 14/45 // * n^1
1 = 14/45*n^1 // : 14/45
45/14 = n^1
n = 45/14
n = 45/14
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