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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
((5/2)/10)/4 = 50/n // - 50/n
((5/2)/10)/4-(50/n) = 0
((5/2)/10)/4-50*n^-1 = 0
-50*n^-1 = -1/16 // : -50
n^-1 = 1/800
-1 < 0
1/(n^1) = 1/800 // * n^1
1 = 1/800*n^1 // : 1/800
800 = n^1
n = 800
n = 800
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