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D( n )
4*n+4 = 0
n^2+n = 0
4*n+4 = 0
4*n+4 = 0
4*n+4 = 0 // - 4
4*n = -4 // : 4
n = -4/4
n = -1
n^2+n = 0
n^2+n = 0
n^2+n = 0
DELTA = 1^2-(0*1*4)
DELTA = 1
DELTA > 0
n = (1^(1/2)-1)/(1*2) or n = (-1^(1/2)-1)/(1*2)
n = 0 or n = -1
n in (-oo:-1) U (-1:0) U (0:+oo)
2/(n^2+n)+3/(4*n+4) = 0
n^2+n = 0
n^2+n = 0
n*(n+1) = 0
n+1 = 0 // - 1
n = -1
n*(n+1) = 0
2/(n*(n+1))+3/(4*n+4) = 0
(2*(4*n+4))/(n*(n+1)*(4*n+4))+(3*n*(n+1))/(n*(n+1)*(4*n+4)) = 0
2*(4*n+4)+3*n*(n+1) = 0
3*n^2+11*n+8 = 0
3*n^2+11*n+8 = 0
3*n^2+11*n+8 = 0
DELTA = 11^2-(3*4*8)
DELTA = 25
DELTA > 0
n = (25^(1/2)-11)/(2*3) or n = (-25^(1/2)-11)/(2*3)
n = -1 or n = -8/3
(n+8/3)*(n+1) = 0
((n+8/3)*(n+1))/(n*(n+1)*(4*n+4)) = 0
((n+8/3)*(n+1))/(n*(n+1)*(4*n+4)) = 0 // * n*(n+1)*(4*n+4)
(n+8/3)*(n+1) = 0
( n+1 )
n+1 = 0 // - 1
n = -1
( n+8/3 )
n+8/3 = 0 // - 8/3
n = -8/3
n in { -1}
n = -8/3
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