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D( w )
w-3 = 0
w-5 = 0
w-3 = 0
w-3 = 0
w-3 = 0 // + 3
w = 3
w-5 = 0
w-5 = 0
w-5 = 0 // + 5
w = 5
w in (-oo:3) U (3:5) U (5:+oo)
3/(w-5)-(1/(w-3)) = 0
3/(w-5)-(w-3)^-1 = 0
3/(w-5)-1/(w-3) = 0
(3*(w-3))/((w-5)*(w-3))+(-1*(w-5))/((w-5)*(w-3)) = 0
3*(w-3)-1*(w-5) = 0
2*w-4 = 0
(2*w-4)/((w-5)*(w-3)) = 0
(2*w-4)/((w-5)*(w-3)) = 0 // * (w-5)*(w-3)
2*w-4 = 0
2*w-4 = 0 // + 4
2*w = 4 // : 2
w = 4/2
w = 2
w = 2
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