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w in (-oo:+oo)
(2*w-1)/2+w+2 = 2*w // - 2*w
(2*w-1)/2+w-(2*w)+2 = 0
(2*w-1)/2+w-2*w+2 = 0
(2*w-1)/2+(2*w)/2+(-2*2*w)/2+(2^2)/2 = 0
2*w+2*w-2*2*w-1+4 = 0
4*w-4*w-1+4 = 0
4-1 = 0
3 = 0
3/2 = 0
3/2 = 0 // * 2
3 = 0
w belongs to the empty set
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