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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
233/n = 86/100 // - 86/100
233/n-(86/100) = 0
233/n-43/50 = 0
233*n^-1 = 43/50 // : 233
n^-1 = 43/11650
-1 < 0
1/(n^1) = 43/11650 // * n^1
1 = 43/11650*n^1 // : 43/11650
11650/43 = n^1
n = 11650/43
n = 11650/43
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