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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/8 = 40/n // - 40/n
5/8-(40/n) = 0
5/8-40*n^-1 = 0
-40*n^-1 = -5/8 // : -40
n^-1 = 1/64
-1 < 0
1/(n^1) = 1/64 // * n^1
1 = 1/64*n^1 // : 1/64
64 = n^1
n = 64
n = 64
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