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D( w )
2*w-2 = 0
w-1 = 0
2*w-2 = 0
2*w-2 = 0
2*w-2 = 0 // + 2
2*w = 2 // : 2
w = 2/2
w = 1
w-1 = 0
w-1 = 0
w-1 = 0 // + 1
w = 1
w in (-oo:1) U (1:+oo)
1/(w-1)-(1/(2*w-2)) = 1/(2*w-2) // - 1/(2*w-2)
1/(w-1)-(1/(2*w-2))-(1/(2*w-2)) = 0
1/(w-1)-(2*w-2)^-1-(2*w-2)^-1 = 0
1/(w-1)-1/(2*w-2)-1/(2*w-2) = 0
(1*(2*w-2))/((w-1)*(2*w-2))+(-1*(w-1))/((w-1)*(2*w-2))+(-1*(w-1))/((w-1)*(2*w-2)) = 0
1*(2*w-2)-1*(w-1)-1*(w-1) = 0
w-w-1+1 = 0
0 = 0
0/((w-1)*(2*w-2)) = 0
0/((w-1)*(2*w-2)) = 0 // * (w-1)*(2*w-2)
0 = 0
w belongs to the empty set
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