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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = (4/7)/8 // - (4/7)/8
6/n-((4/7)/8) = 0
6/n-1/14 = 0
6*n^-1 = 1/14 // : 6
n^-1 = 1/84
-1 < 0
1/(n^1) = 1/84 // * n^1
1 = 1/84*n^1 // : 1/84
84 = n^1
n = 84
n = 84
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