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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
1086/N = 112 // - 112
1086/N-112 = 0
1086*N^-1 = 112 // : 1086
N^-1 = 56/543
-1 < 0
1/(N^1) = 56/543 // * N^1
1 = 56/543*N^1 // : 56/543
543/56 = N^1
N = 543/56
N = 543/56
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