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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
6/N = -24 // + 24
6/N+24 = 0
6*N^-1 = -24 // : 6
N^-1 = -4
-1 < 0
1/(N^1) = -4 // * N^1
1 = -4*N^1 // : -4
-1/4 = N^1
N = -1/4
N = -1/4
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