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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
14/n = 19/9 // - 19/9
14/n-(19/9) = 0
14/n-19/9 = 0
14*n^-1 = 19/9 // : 14
n^-1 = 19/126
-1 < 0
1/(n^1) = 19/126 // * n^1
1 = 19/126*n^1 // : 19/126
126/19 = n^1
n = 126/19
n = 126/19
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