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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3.5/n = 1.5/4.5 // - 1.5/4.5
3.5/n-(1.5/4.5) = 0
3.5/n-0.33333333 = 0
3.5*n^-1 = 0.33333333 // : 3.5
n^-1 = 0.09523809
-1 < 0
1/(n^1) = 0.09523809 // * n^1
1 = 0.09523809*n^1 // : 0.09523809
10.50000058 = n^1
n = 10.50000058
n = 10.50000058
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