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w in (-oo:+oo)
(2/3)*w+1/3 = w-1 // - w-1
(2/3)*w-w+1/3+1 = 0
4/3-1/3*w = 0 // - 4/3
-1/3*w = -4/3 // : -1/3
w = -4/3/(-1/3)
w = 4
w = 4
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