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D( w )
w-5 = 0
w-4 = 0
w-5 = 0
w-5 = 0
w-5 = 0 // + 5
w = 5
w-4 = 0
w-4 = 0
w-4 = 0 // + 4
w = 4
w in (-oo:4) U (4:5) U (5:+oo)
(w-6)/(w-4) = (w-7)/(w-5)+1 // - (w-7)/(w-5)+1
(w-6)/(w-4)-((w-7)/(w-5))-1 = 0
(w-6)/(w-4)+(-1*(w-7))/(w-5)-1 = 0
((w-6)*(w-5))/((w-4)*(w-5))+(-1*(w-7)*(w-4))/((w-4)*(w-5))+(-1*(w-4)*(w-5))/((w-4)*(w-5)) = 0
(w-6)*(w-5)-1*(w-7)*(w-4)-1*(w-4)*(w-5) = 0
9*w-w^2-20+2 = 0
9*w-w^2-18 = 0
9*w-w^2-18 = 0
9*w-w^2-18 = 0
DELTA = 9^2-(-18*(-1)*4)
DELTA = 9
DELTA > 0
w = (9^(1/2)-9)/(-1*2) or w = (-9^(1/2)-9)/(-1*2)
w = 3 or w = 6
(w-3)*(w-6) = 0
((w-3)*(w-6))/((w-4)*(w-5)) = 0
((w-3)*(w-6))/((w-4)*(w-5)) = 0 // * (w-4)*(w-5)
(w-3)*(w-6) = 0
( w-3 )
w-3 = 0 // + 3
w = 3
( w-6 )
w-6 = 0 // + 6
w = 6
w in { 3, 6 }
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