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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-7)/(w-3)+1 // - (w-7)/(w-3)+1
(w-5)/(w-1)-((w-7)/(w-3))-1 = 0
(w-5)/(w-1)+(-1*(w-7))/(w-3)-1 = 0
((w-5)*(w-3))/((w-1)*(w-3))+(-1*(w-7)*(w-1))/((w-1)*(w-3))+(-1*(w-1)*(w-3))/((w-1)*(w-3)) = 0
(w-5)*(w-3)-1*(w-7)*(w-1)-1*(w-1)*(w-3) = 0
4*w-w^2-3+8 = 0
4*w-w^2+5 = 0
4*w-w^2+5 = 0
4*w-w^2+5 = 0
DELTA = 4^2-(-1*4*5)
DELTA = 36
DELTA > 0
w = (36^(1/2)-4)/(-1*2) or w = (-36^(1/2)-4)/(-1*2)
w = -1 or w = 5
(w+1)*(w-5) = 0
((w+1)*(w-5))/((w-1)*(w-3)) = 0
((w+1)*(w-5))/((w-1)*(w-3)) = 0 // * (w-1)*(w-3)
(w+1)*(w-5) = 0
( w+1 )
w+1 = 0 // - 1
w = -1
( w-5 )
w-5 = 0 // + 5
w = 5
w in { -1, 5 }
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