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D( w )
w-3 = 0
w-2 = 0
w-3 = 0
w-3 = 0
w-3 = 0 // + 3
w = 3
w-2 = 0
w-2 = 0
w-2 = 0 // + 2
w = 2
w in (-oo:2) U (2:3) U (3:+oo)
(w+7)/(w-3)+1 = (w+2)/(w-2) // - (w+2)/(w-2)
(w+7)/(w-3)-((w+2)/(w-2))+1 = 0
(w+7)/(w-3)+(-1*(w+2))/(w-2)+1 = 0
((w+7)*(w-2))/((w-3)*(w-2))+(-1*(w+2)*(w-3))/((w-3)*(w-2))+(1*(w-3)*(w-2))/((w-3)*(w-2)) = 0
(w+7)*(w-2)-1*(w+2)*(w-3)+1*(w-3)*(w-2) = 0
w^2+6*w-5*w-8+6 = 0
w^2+w-2 = 0
w^2+w-2 = 0
w^2+w-2 = 0
DELTA = 1^2-(-2*1*4)
DELTA = 9
DELTA > 0
w = (9^(1/2)-1)/(1*2) or w = (-9^(1/2)-1)/(1*2)
w = 1 or w = -2
(w+2)*(w-1) = 0
((w+2)*(w-1))/((w-3)*(w-2)) = 0
((w+2)*(w-1))/((w-3)*(w-2)) = 0 // * (w-3)*(w-2)
(w+2)*(w-1) = 0
( w+2 )
w+2 = 0 // - 2
w = -2
( w-1 )
w-1 = 0 // + 1
w = 1
w in { -2, 1 }
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