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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/3.4 = 2.5/n // - 2.5/n
5/3.4-(2.5/n) = 0
5/3.4-2.5*n^-1 = 0
-2.5*n^-1 = -1.47058824 // : -2.5
n^-1 = 0.5882353
-1 < 0
1/(n^1) = 0.5882353 // * n^1
1 = 0.5882353*n^1 // : 0.5882353
1.69999998 = n^1
n = 1.69999998
n = 1.69999998
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