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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
12/n = 72/108 // - 72/108
12/n-(72/108) = 0
12/n-2/3 = 0
12*n^-1 = 2/3 // : 12
n^-1 = 1/18
-1 < 0
1/(n^1) = 1/18 // * n^1
1 = 1/18*n^1 // : 1/18
18 = n^1
n = 18
n = 18
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