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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7.5/n = 241.88 // - 241.88
7.5/n-241.88 = 0
7.5*n^-1 = 241.88 // : 7.5
n^-1 = 32.25066667
-1 < 0
1/(n^1) = 32.25066667 // * n^1
1 = 32.25066667*n^1 // : 32.25066667
0.03100711 = n^1
n = 0.03100711
n = 0.03100711
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