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w in (-oo:+oo)
(5/7)*w = 1/2 // - 1/2
(5/7)*w-(1/2) = 0
(5/7)*w-1/2 = 0
5/7*w-1/2 = 0 // + 1/2
5/7*w = 1/2 // : 5/7
w = 1/2/5/7
w = 7/10
w = 7/10
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