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w in (-oo:+oo)
(1/6)*w+(2/3)*w+8 = 77/9 // - 77/9
(1/6)*w+(2/3)*w-(77/9)+8 = 0
(1/6)*w+(2/3)*w-77/9+8 = 0
5/6*w-5/9 = 0 // + 5/9
5/6*w = 5/9 // : 5/6
w = 5/9/5/6
w = 2/3
w = 2/3
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