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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
40/n = 8/5 // - 8/5
40/n-(8/5) = 0
40/n-8/5 = 0
40*n^-1 = 8/5 // : 40
n^-1 = 1/25
-1 < 0
1/(n^1) = 1/25 // * n^1
1 = 1/25*n^1 // : 1/25
25 = n^1
n = 25
n = 25
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