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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
0.5 = (5-(5*N))/N+1 // - (5-(5*N))/N+1
0.5-((5-(5*N))/N)-1 = 0
0.5-((5-5*N)/N)-1 = 0
(-1*(5-5*N))/N-1+0.5 = 0
(-1*(5-5*N))/N+(-1*N)/N+(0.5*N)/N = 0
0.5*N-1*(5-5*N)-1*N = 0
4*N+0.5*N-5 = 0
4.5*N-5 = 0
(4.5*N-5)/N = 0
(4.5*N-5)/N = 0 // * N
4.5*N-5 = 0
4.5*N-5 = 0 // + 5
4.5*N = 5 // : 4.5
N = 5/4.5
N = 1.11111111
N = 1.11111111
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