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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
12/n = 9/13 // - 9/13
12/n-(9/13) = 0
12/n-9/13 = 0
12*n^-1 = 9/13 // : 12
n^-1 = 3/52
-1 < 0
1/(n^1) = 3/52 // * n^1
1 = 3/52*n^1 // : 3/52
52/3 = n^1
n = 52/3
n = 52/3
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