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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
46/n = 5.75 // - 5.75
46/n-5.75 = 0
46*n^-1 = 5.75 // : 46
n^-1 = 0.125
-1 < 0
1/(n^1) = 0.125 // * n^1
1 = 0.125*n^1 // : 0.125
8 = n^1
n = 8
n = 8
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