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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/n = 2/(11/12) // - 2/(11/12)
4/n-(2/(11/12)) = 0
4/n-24/11 = 0
4*n^-1 = 24/11 // : 4
n^-1 = 6/11
-1 < 0
1/(n^1) = 6/11 // * n^1
1 = 6/11*n^1 // : 6/11
11/6 = n^1
n = 11/6
n = 11/6
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