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