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D( w )
w-3 = 0
w-7 = 0
w-3 = 0
w-3 = 0
w-3 = 0 // + 3
w = 3
w-7 = 0
w-7 = 0
w-7 = 0 // + 7
w = 7
w in (-oo:3) U (3:7) U (7:+oo)
(w-1)/(w-3) = (w+5)/(w-7)+1 // - (w+5)/(w-7)+1
(w-1)/(w-3)-((w+5)/(w-7))-1 = 0
(w-1)/(w-3)+(-1*(w+5))/(w-7)-1 = 0
((w-1)*(w-7))/((w-3)*(w-7))+(-1*(w+5)*(w-3))/((w-3)*(w-7))+(-1*(w-3)*(w-7))/((w-3)*(w-7)) = 0
(w-1)*(w-7)-1*(w+5)*(w-3)-1*(w-3)*(w-7) = 0
10*w-w^2-10*w-21+22 = 0
1-w^2 = 0
(1-w^2)/((w-3)*(w-7)) = 0
(1-w^2)/((w-3)*(w-7)) = 0 // * (w-3)*(w-7)
1-w^2 = 0
-1*w^2 = -1 // : -1
w^2 = 1
w^2 = 1 // ^ 1/2
abs(w) = 1
w = 1 or w = -1
w in { 1, -1 }
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