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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/n-10 = 5/4 // - 5/4
2/n-(5/4)-10 = 0
2/n-5/4-10 = 0
2*n^-1 = 45/4 // : 2
n^-1 = 45/8
-1 < 0
1/(n^1) = 45/8 // * n^1
1 = 45/8*n^1 // : 45/8
8/45 = n^1
n = 8/45
n = 8/45
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