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D( w )
w+4 = 0
w+2 = 0
w+4 = 0
w+4 = 0
w+4 = 0 // - 4
w = -4
w+2 = 0
w+2 = 0
w+2 = 0 // - 2
w = -2
w in (-oo:-4) U (-4:-2) U (-2:+oo)
(w-1)/(w+2) = (w+2)/(w+4)-1 // - (w+2)/(w+4)-1
(w-1)/(w+2)-((w+2)/(w+4))+1 = 0
(w-1)/(w+2)+(-1*(w+2))/(w+4)+1 = 0
((w-1)*(w+4))/((w+2)*(w+4))+(-1*(w+2)^2)/((w+2)*(w+4))+(1*(w+2)*(w+4))/((w+2)*(w+4)) = 0
(w-1)*(w+4)-1*(w+2)^2+1*(w+2)*(w+4) = 0
w^2-w+6*w-8+8 = 0
w^2+5*w = 0
w^2+5*w = 0
w*(w+5) = 0
w+5 = 0 // - 5
w = -5
w*(w+5) = 0
(w*(w+5))/((w+2)*(w+4)) = 0
(w*(w+5))/((w+2)*(w+4)) = 0 // * (w+2)*(w+4)
w*(w+5) = 0
( w+5 )
w+5 = 0 // - 5
w = -5
( w )
w = 0
w in { -5, 0 }
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