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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = 15/12 // - 15/12
6/n-(15/12) = 0
6/n-5/4 = 0
6*n^-1 = 5/4 // : 6
n^-1 = 5/24
-1 < 0
1/(n^1) = 5/24 // * n^1
1 = 5/24*n^1 // : 5/24
24/5 = n^1
n = 24/5
n = 24/5
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