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w in (-oo:+oo)
(6/7)*w+4/5 = 298/35 // - 298/35
(6/7)*w+4/5-(298/35) = 0
(6/7)*w+4/5-298/35 = 0
6/7*w-54/7 = 0 // + 54/7
6/7*w = 54/7 // : 6/7
w = 54/7/6/7
w = 9
w = 9
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