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w in (-oo:+oo)
(2/3)*w+7/8 = 109/88 // - 109/88
(2/3)*w+7/8-(109/88) = 0
(2/3)*w+7/8-109/88 = 0
2/3*w-4/11 = 0 // + 4/11
2/3*w = 4/11 // : 2/3
w = 4/11/2/3
w = 6/11
w = 6/11
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