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D( w )
w-3 = 0
w-6 = 0
w-3 = 0
w-3 = 0
w-3 = 0 // + 3
w = 3
w-6 = 0
w-6 = 0
w-6 = 0 // + 6
w = 6
w in (-oo:3) U (3:6) U (6:+oo)
(w-3)/(w-6) = (w+5)/(w-3)+1 // - (w+5)/(w-3)+1
(w-3)/(w-6)-((w+5)/(w-3))-1 = 0
(w-3)/(w-6)+(-1*(w+5))/(w-3)-1 = 0
((w-3)^2)/((w-6)*(w-3))+(-1*(w+5)*(w-6))/((w-6)*(w-3))+(-1*(w-6)*(w-3))/((w-6)*(w-3)) = 0
(w-3)^2-1*(w+5)*(w-6)-1*(w-6)*(w-3) = 0
9*w-w^2-5*w-18+39 = 0
4*w-w^2+21 = 0
4*w-w^2+21 = 0
4*w-w^2+21 = 0
DELTA = 4^2-(-1*4*21)
DELTA = 100
DELTA > 0
w = (100^(1/2)-4)/(-1*2) or w = (-100^(1/2)-4)/(-1*2)
w = -3 or w = 7
(w+3)*(w-7) = 0
((w+3)*(w-7))/((w-6)*(w-3)) = 0
((w+3)*(w-7))/((w-6)*(w-3)) = 0 // * (w-6)*(w-3)
(w+3)*(w-7) = 0
( w+3 )
w+3 = 0 // - 3
w = -3
( w-7 )
w-7 = 0 // + 7
w = 7
w in { -3, 7 }
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