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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/n = 9/6 // - 9/6
4/n-(9/6) = 0
4/n-3/2 = 0
4*n^-1 = 3/2 // : 4
n^-1 = 3/8
-1 < 0
1/(n^1) = 3/8 // * n^1
1 = 3/8*n^1 // : 3/8
8/3 = n^1
n = 8/3
n = 8/3
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