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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
35/n = 4/8 // - 4/8
35/n-(4/8) = 0
35/n-1/2 = 0
35*n^-1 = 1/2 // : 35
n^-1 = 1/70
-1 < 0
1/(n^1) = 1/70 // * n^1
1 = 1/70*n^1 // : 1/70
70 = n^1
n = 70
n = 70
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