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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/n = 0.8/3.2 // - 0.8/3.2
8/n-(0.8/3.2) = 0
8/n-0.25 = 0
8*n^-1 = 0.25 // : 8
n^-1 = 0.03125
-1 < 0
1/(n^1) = 0.03125 // * n^1
1 = 0.03125*n^1 // : 0.03125
32 = n^1
n = 32
n = 32
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