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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/n = (41/6)/100 // - (41/6)/100
2/n-((41/6)/100) = 0
2/n-41/600 = 0
2*n^-1 = 41/600 // : 2
n^-1 = 41/1200
-1 < 0
1/(n^1) = 41/1200 // * n^1
1 = 41/1200*n^1 // : 41/1200
1200/41 = n^1
n = 1200/41
n = 1200/41
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