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w in (-oo:+oo)
(5/2)*w = 5/8 // - 5/8
(5/2)*w-(5/8) = 0
(5/2)*w-5/8 = 0
5/2*w-5/8 = 0 // + 5/8
5/2*w = 5/8 // : 5/2
w = 5/8/5/2
w = 1/4
w = 1/4
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