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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7.6/n = 4/15 // - 4/15
7.6/n-(4/15) = 0
7.6/n-4/15 = 0
7.6*n^-1 = 4/15 // : 7.6
n^-1 = 0.03508772
-1 < 0
1/(n^1) = 0.03508772 // * n^1
1 = 0.03508772*n^1 // : 0.03508772
28.49999943 = n^1
n = 28.49999943
n = 28.49999943
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