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D( w )
w+3 = 0
w+1 = 0
w+3 = 0
w+3 = 0
w+3 = 0 // - 3
w = -3
w+1 = 0
w+1 = 0
w+1 = 0 // - 1
w = -1
w in (-oo:-3) U (-3:-1) U (-1:+oo)
1/(w+1)+6 = 6/(w+3) // - 6/(w+3)
1/(w+1)-(6/(w+3))+6 = 0
1/(w+1)-6*(w+3)^-1+6 = 0
1/(w+1)-6/(w+3)+6 = 0
(1*(w+3))/((w+1)*(w+3))+(-6*(w+1))/((w+1)*(w+3))+(6*(w+1)*(w+3))/((w+1)*(w+3)) = 0
1*(w+3)-6*(w+1)+6*(w+1)*(w+3) = 0
6*w^2-5*w+24*w-3+18 = 0
6*w^2+19*w+15 = 0
6*w^2+19*w+15 = 0
6*w^2+19*w+15 = 0
DELTA = 19^2-(4*6*15)
DELTA = 1
DELTA > 0
w = (1^(1/2)-19)/(2*6) or w = (-1^(1/2)-19)/(2*6)
w = -3/2 or w = -5/3
(w+5/3)*(w+3/2) = 0
((w+5/3)*(w+3/2))/((w+1)*(w+3)) = 0
((w+5/3)*(w+3/2))/((w+1)*(w+3)) = 0 // * (w+1)*(w+3)
(w+5/3)*(w+3/2) = 0
( w+3/2 )
w+3/2 = 0 // - 3/2
w = -3/2
( w+5/3 )
w+5/3 = 0 // - 5/3
w = -5/3
w in { -3/2, -5/3 }
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