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w in (-oo:+oo)
(6/7)*w+2/7 = 8/7 // - 8/7
(6/7)*w+2/7-(8/7) = 0
(6/7)*w+2/7-8/7 = 0
6/7*w-6/7 = 0 // + 6/7
6/7*w = 6/7 // : 6/7
w = 6/7/6/7
w = 1
w = 1
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