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