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w in (-oo:+oo)
(7/2)*w = 7/8 // - 7/8
(7/2)*w-(7/8) = 0
(7/2)*w-7/8 = 0
7/2*w-7/8 = 0 // + 7/8
7/2*w = 7/8 // : 7/2
w = 7/8/7/2
w = 1/4
w = 1/4
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