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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
14/8 = 42/n // - 42/n
14/8-(42/n) = 0
14/8-42*n^-1 = 0
-42*n^-1 = -7/4 // : -42
n^-1 = 1/24
-1 < 0
1/(n^1) = 1/24 // * n^1
1 = 1/24*n^1 // : 1/24
24 = n^1
n = 24
n = 24
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