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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/n = 36/16 // - 36/16
8/n-(36/16) = 0
8/n-9/4 = 0
8*n^-1 = 9/4 // : 8
n^-1 = 9/32
-1 < 0
1/(n^1) = 9/32 // * n^1
1 = 9/32*n^1 // : 9/32
32/9 = n^1
n = 32/9
n = 32/9
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