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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1.8/n = 12/17 // - 12/17
1.8/n-(12/17) = 0
1.8/n-12/17 = 0
1.8*n^-1 = 12/17 // : 1.8
n^-1 = 0.39215686
-1 < 0
1/(n^1) = 0.39215686 // * n^1
1 = 0.39215686*n^1 // : 0.39215686
2.55000002 = n^1
n = 2.55000002
n = 2.55000002
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