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w in (-oo:+oo)
(1/2)*w-2 = (2/3)*w // - (2/3)*w
(1/2)*w-((2/3)*w)-2 = 0
(1/2)*w+(-2/3)*w-2 = 0
-1/6*w-2 = 0 // + 2
-1/6*w = 2 // : -1/6
w = 2/(-1/6)
w = -12
w = -12
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