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w in (-oo:+oo)
(5/7)*w-7*w+5/6 = 155/42 // - 155/42
(5/7)*w-7*w+5/6-(155/42) = 0
(5/7)*w-7*w+5/6-155/42 = 0
-44/7*w-20/7 = 0 // + 20/7
-44/7*w = 20/7 // : -44/7
w = 20/7/(-44/7)
w = -5/11
w = -5/11
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