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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
272/n = 8/18 // - 8/18
272/n-(8/18) = 0
272/n-4/9 = 0
272*n^-1 = 4/9 // : 272
n^-1 = 1/612
-1 < 0
1/(n^1) = 1/612 // * n^1
1 = 1/612*n^1 // : 1/612
612 = n^1
n = 612
n = 612
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