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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n = 1.2/0.7 // - 1.2/0.7
6/n-(1.2/0.7) = 0
6/n-1.71428571 = 0
6*n^-1 = 1.71428571 // : 6
n^-1 = 0.28571429
-1 < 0
1/(n^1) = 0.28571429 // * n^1
1 = 0.28571429*n^1 // : 0.28571429
3.49999995 = n^1
n = 3.49999995
n = 3.49999995
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