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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/1.8 = 6/n // - 6/n
4/1.8-(6/n) = 0
4/1.8-6*n^-1 = 0
-6*n^-1 = -2.22222222 // : -6
n^-1 = 0.37037037
-1 < 0
1/(n^1) = 0.37037037 // * n^1
1 = 0.37037037*n^1 // : 0.37037037
2.7 = n^1
n = 2.7
n = 2.7
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