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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/3 = 12/n // - 12/n
8/3-(12/n) = 0
8/3-12*n^-1 = 0
-12*n^-1 = -8/3 // : -12
n^-1 = 2/9
-1 < 0
1/(n^1) = 2/9 // * n^1
1 = 2/9*n^1 // : 2/9
9/2 = n^1
n = 9/2
n = 9/2
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