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