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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)
6-(5/(w+3)) = -6/(w-1) // + -6/(w-1)
6-(5/(w+3))-(-6/(w-1)) = 0
6*(w-1)^-1-5*(w+3)^-1+6 = 0
6/(w-1)-5/(w+3)+6 = 0
(-5*(w-1))/((w+3)*(w-1))+(6*(w+3))/((w+3)*(w-1))+(6*(w+3)*(w-1))/((w+3)*(w-1)) = 0
6*(w+3)-5*(w-1)+6*(w+3)*(w-1) = 0
6*w^2+w+12*w-18+23 = 0
6*w^2+13*w+5 = 0
6*w^2+13*w+5 = 0
6*w^2+13*w+5 = 0
DELTA = 13^2-(4*5*6)
DELTA = 49
DELTA > 0
w = (49^(1/2)-13)/(2*6) or w = (-49^(1/2)-13)/(2*6)
w = -1/2 or w = -5/3
(w+5/3)*(w+1/2) = 0
((w+5/3)*(w+1/2))/((w+3)*(w-1)) = 0
((w+5/3)*(w+1/2))/((w+3)*(w-1)) = 0 // * (w+3)*(w-1)
(w+5/3)*(w+1/2) = 0
( w+1/2 )
w+1/2 = 0 // - 1/2
w = -1/2
( w+5/3 )
w+5/3 = 0 // - 5/3
w = -5/3
w in { -1/2, -5/3 }
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