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w in (-oo:+oo)
(5/6)*w+5/8 = 55/56 // - 55/56
(5/6)*w+5/8-(55/56) = 0
(5/6)*w+5/8-55/56 = 0
5/6*w-5/14 = 0 // + 5/14
5/6*w = 5/14 // : 5/6
w = 5/14/5/6
w = 3/7
w = 3/7
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