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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
9/N = 1/4 // - 1/4
9/N-(1/4) = 0
9/N-1/4 = 0
9*N^-1 = 1/4 // : 9
N^-1 = 1/36
-1 < 0
1/(N^1) = 1/36 // * N^1
1 = 1/36*N^1 // : 1/36
36 = N^1
N = 36
N = 36
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