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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = 75/100 // - 75/100
6/n-(75/100) = 0
6/n-3/4 = 0
6*n^-1 = 3/4 // : 6
n^-1 = 1/8
-1 < 0
1/(n^1) = 1/8 // * n^1
1 = 1/8*n^1 // : 1/8
8 = n^1
n = 8
n = 8
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