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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/n = 12/3 // - 12/3
8/n-(12/3) = 0
8/n-4 = 0
8*n^-1 = 4 // : 8
n^-1 = 1/2
-1 < 0
1/(n^1) = 1/2 // * n^1
1 = 1/2*n^1 // : 1/2
2 = n^1
n = 2
n = 2
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