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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/2.02 = 5/n // - 5/n
2/2.02-(5/n) = 0
2/2.02-5*n^-1 = 0
-5*n^-1 = -0.99009901 // : -5
n^-1 = 0.1980198
-1 < 0
1/(n^1) = 0.1980198 // * n^1
1 = 0.1980198*n^1 // : 0.1980198
5.05000005 = n^1
n = 5.05000005
n = 5.05000005
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