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D( n )
1*n = 0
1*n = 0
1*n = 0
n = 0
n in (-oo:0) U (0:+oo)
1.2/(1*n) = 0.2 // - 0.2
1.2/(1*n)-0.2 = 0
1.2/n-0.2 = 0
1.2*n^-1 = 0.2 // : 1.2
n^-1 = 0.16666667
-1 < 0
1/(n^1) = 0.16666667 // * n^1
1 = 0.16666667*n^1 // : 0.16666667
5.99999988 = n^1
n = 5.99999988
n = 5.99999988
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