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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5.46/n = -2.73 // + 2.73
5.46/n+2.73 = 0
5.46*n^-1 = -2.73 // : 5.46
n^-1 = -0.5
-1 < 0
1/(n^1) = -0.5 // * n^1
1 = -0.5*n^1 // : -0.5
-2 = n^1
n = -2
n = -2
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