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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = 9/8 // - 9/8
6/n-(9/8) = 0
6/n-9/8 = 0
6*n^-1 = 9/8 // : 6
n^-1 = 3/16
-1 < 0
1/(n^1) = 3/16 // * n^1
1 = 3/16*n^1 // : 3/16
16/3 = n^1
n = 16/3
n = 16/3
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