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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n = 1/8 // - 1/8
3/n-(1/8) = 0
3/n-1/8 = 0
3*n^-1 = 1/8 // : 3
n^-1 = 1/24
-1 < 0
1/(n^1) = 1/24 // * n^1
1 = 1/24*n^1 // : 1/24
24 = n^1
n = 24
n = 24
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