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w in (-oo:+oo)
(1/7)*w+5/7 = 8/7 // - 8/7
(1/7)*w+5/7-(8/7) = 0
(1/7)*w+5/7-8/7 = 0
1/7*w-3/7 = 0 // + 3/7
1/7*w = 3/7 // : 1/7
w = 3/7/1/7
w = 3
w = 3
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