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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-2/n = 1.6/11.2 // - 1.6/11.2
-2/n-(1.6/11.2) = 0
-2/n-0.14285714 = 0
-2*n^-1 = 0.14285714 // : -2
n^-1 = -0.07142857
-1 < 0
1/(n^1) = -0.07142857 // * n^1
1 = -0.07142857*n^1 // : -0.07142857
-14.00000028 = n^1
n = -14.00000028
n = -14.00000028
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