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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-14/n = 12/48 // - 12/48
-14/n-(12/48) = 0
-14/n-1/4 = 0
-14*n^-1 = 1/4 // : -14
n^-1 = -1/56
-1 < 0
1/(n^1) = -1/56 // * n^1
1 = -1/56*n^1 // : -1/56
-56 = n^1
n = -56
n = -56
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