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D( N )
N+1 = 0
N+1 = 0
N+1 = 0
N+1 = 0 // - 1
N = -1
N in (-oo:-1) U (-1:+oo)
5/6 = N/(N+1) // - N/(N+1)
5/6-(N/(N+1)) = 0
(-1*N)/(N+1)+5/6 = 0
(-1*6*N)/(6*(N+1))+(5*(N+1))/(6*(N+1)) = 0
5*(N+1)-1*6*N = 0
5-N = 0
(5-N)/(6*(N+1)) = 0
(5-N)/(6*(N+1)) = 0 // * 6*(N+1)
5-N = 0
5-N = 0 // - 5
-N = -5 // * -1
N = 5
N = 5
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