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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
57/n = 19/9 // - 19/9
57/n-(19/9) = 0
57/n-19/9 = 0
57*n^-1 = 19/9 // : 57
n^-1 = 1/27
-1 < 0
1/(n^1) = 1/27 // * n^1
1 = 1/27*n^1 // : 1/27
27 = n^1
n = 27
n = 27
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