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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3*n+(5*n)/n-(2/2)+1+1 = 0
3*n+(5*n)/n-1+1+1 = 0
3*n+6 = 0 // - 6
3*n = -6 // : 3
n = -6/3
n = -2
n = -2
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