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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
0.5/n = 2.5/3.5 // - 2.5/3.5
0.5/n-(2.5/3.5) = 0
0.5/n-0.71428571 = 0
0.5*n^-1 = 0.71428571 // : 0.5
n^-1 = 1.42857142
-1 < 0
1/(n^1) = 1.42857142 // * n^1
1 = 1.42857142*n^1 // : 1.42857142
0.7 = n^1
n = 0.7
n = 0.7
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