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D( w )
w+1 = 0
w+2 = 0
w+1 = 0
w+1 = 0
w+1 = 0 // - 1
w = -1
w+2 = 0
w+2 = 0
w+2 = 0 // - 2
w = -2
w in (-oo:-2) U (-2:-1) U (-1:+oo)
4-(3/(w+1)) = -3/(w+2) // + -3/(w+2)
4-(3/(w+1))-(-3/(w+2)) = 0
3*(w+2)^-1-3*(w+1)^-1+4 = 0
3/(w+2)-3/(w+1)+4 = 0
(-3*(w+2))/((w+1)*(w+2))+(3*(w+1))/((w+1)*(w+2))+(4*(w+1)*(w+2))/((w+1)*(w+2)) = 0
3*(w+1)-3*(w+2)+4*(w+1)*(w+2) = 0
4*w^2+12*w-3+8 = 0
4*w^2+12*w+5 = 0
4*w^2+12*w+5 = 0
4*w^2+12*w+5 = 0
DELTA = 12^2-(4*4*5)
DELTA = 64
DELTA > 0
w = (64^(1/2)-12)/(2*4) or w = (-64^(1/2)-12)/(2*4)
w = -1/2 or w = -5/2
(w+5/2)*(w+1/2) = 0
((w+5/2)*(w+1/2))/((w+1)*(w+2)) = 0
((w+5/2)*(w+1/2))/((w+1)*(w+2)) = 0 // * (w+1)*(w+2)
(w+5/2)*(w+1/2) = 0
( w+1/2 )
w+1/2 = 0 // - 1/2
w = -1/2
( w+5/2 )
w+5/2 = 0 // - 5/2
w = -5/2
w in { -1/2, -5/2 }
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