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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
10/N = 1/14 // - 1/14
10/N-(1/14) = 0
10/N-1/14 = 0
10*N^-1 = 1/14 // : 10
N^-1 = 1/140
-1 < 0
1/(N^1) = 1/140 // * N^1
1 = 1/140*N^1 // : 1/140
140 = N^1
N = 140
N = 140
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