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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
20/24 = 5/n // - 5/n
20/24-(5/n) = 0
20/24-5*n^-1 = 0
-5*n^-1 = -5/6 // : -5
n^-1 = 1/6
-1 < 0
1/(n^1) = 1/6 // * n^1
1 = 1/6*n^1 // : 1/6
6 = n^1
n = 6
n = 6
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