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