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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
15/n = 3/4 // - 3/4
15/n-(3/4) = 0
15/n-3/4 = 0
15*n^-1 = 3/4 // : 15
n^-1 = 1/20
-1 < 0
1/(n^1) = 1/20 // * n^1
1 = 1/20*n^1 // : 1/20
20 = n^1
n = 20
n = 20
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