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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/n = 10/5 // - 10/5
8/n-(10/5) = 0
8/n-2 = 0
8*n^-1 = 2 // : 8
n^-1 = 1/4
-1 < 0
1/(n^1) = 1/4 // * n^1
1 = 1/4*n^1 // : 1/4
4 = n^1
n = 4
n = 4
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