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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
16/n = 36/27 // - 36/27
16/n-(36/27) = 0
16/n-4/3 = 0
16*n^-1 = 4/3 // : 16
n^-1 = 1/12
-1 < 0
1/(n^1) = 1/12 // * n^1
1 = 1/12*n^1 // : 1/12
12 = n^1
n = 12
n = 12
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