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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
72.3/3 = 14/n // - 14/n
72.3/3-(14/n) = 0
72.3/3-14*n^-1 = 0
-14*n^-1 = -24.1 // : -14
n^-1 = 1.72142857
-1 < 0
1/(n^1) = 1.72142857 // * n^1
1 = 1.72142857*n^1 // : 1.72142857
0.58091286 = n^1
n = 0.58091286
n = 0.58091286
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