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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/n+n/n-2-1 = 5 // - 5
4/n+n/n-5-2-1 = 0
4*n^-1 = 7 // : 4
n^-1 = 7/4
-1 < 0
1/(n^1) = 7/4 // * n^1
1 = 7/4*n^1 // : 7/4
4/7 = n^1
n = 4/7
n = 4/7
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