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w in (-oo:+oo)
(5/7)*w+4 = 338/77 // - 338/77
(5/7)*w-(338/77)+4 = 0
(5/7)*w-338/77+4 = 0
5/7*w-30/77 = 0 // + 30/77
5/7*w = 30/77 // : 5/7
w = 30/77/5/7
w = 6/11
w = 6/11
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