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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7/n = 100 // - 100
7/n-100 = 0
7*n^-1 = 100 // : 7
n^-1 = 100/7
-1 < 0
1/(n^1) = 100/7 // * n^1
1 = 100/7*n^1 // : 100/7
7/100 = n^1
n = 7/100
n = 7/100
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