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w in (-oo:+oo)
(7/8)*w = 8/9 // - 8/9
(7/8)*w-(8/9) = 0
(7/8)*w-8/9 = 0
7/8*w-8/9 = 0 // + 8/9
7/8*w = 8/9 // : 7/8
w = 8/9/7/8
w = 64/63
w = 64/63
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