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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
40/25 = 16/n // - 16/n
40/25-(16/n) = 0
40/25-16*n^-1 = 0
-16*n^-1 = -8/5 // : -16
n^-1 = 1/10
-1 < 0
1/(n^1) = 1/10 // * n^1
1 = 1/10*n^1 // : 1/10
10 = n^1
n = 10
n = 10
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