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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:1) U (1:3) U (3:+oo)
(w-5)/(w-1) = (w+2)/(w-3)+1 // - (w+2)/(w-3)+1
(w-5)/(w-1)-((w+2)/(w-3))-1 = 0
(w-5)/(w-1)+(-1*(w+2))/(w-3)-1 = 0
((w-5)*(w-3))/((w-1)*(w-3))+(-1*(w+2)*(w-1))/((w-1)*(w-3))+(-1*(w-1)*(w-3))/((w-1)*(w-3)) = 0
(w-5)*(w-3)-1*(w+2)*(w-1)-1*(w-1)*(w-3) = 0
4*w-w^2-9*w-3+17 = 0
14-w^2-5*w = 0
14-w^2-5*w = 0
14-w^2-5*w = 0
DELTA = (-5)^2-(-1*4*14)
DELTA = 81
DELTA > 0
w = (81^(1/2)+5)/(-1*2) or w = (5-81^(1/2))/(-1*2)
w = -7 or w = 2
(w+7)*(w-2) = 0
((w+7)*(w-2))/((w-1)*(w-3)) = 0
((w+7)*(w-2))/((w-1)*(w-3)) = 0 // * (w-1)*(w-3)
(w+7)*(w-2) = 0
( w+7 )
w+7 = 0 // - 7
w = -7
( w-2 )
w-2 = 0 // + 2
w = 2
w in { -7, 2 }
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