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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7/8 = 6/n+4 // - 6/n+4
7/8-(6/n)-4 = 0
7/8-6*n^-1-4 = 0
-6*n^-1 = 25/8 // : -6
n^-1 = -25/48
-1 < 0
1/(n^1) = -25/48 // * n^1
1 = -25/48*n^1 // : -25/48
-48/25 = n^1
n = -48/25
n = -48/25
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