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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/n = 4/2.5 // - 4/2.5
8/n-(4/2.5) = 0
8/n-1.6 = 0
8*n^-1 = 1.6 // : 8
n^-1 = 0.2
-1 < 0
1/(n^1) = 0.2 // * n^1
1 = 0.2*n^1 // : 0.2
5 = n^1
n = 5
n = 5
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