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