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w in (-oo:+oo)
(2/5)*w = 5/8 // - 5/8
(2/5)*w-(5/8) = 0
(2/5)*w-5/8 = 0
2/5*w-5/8 = 0 // + 5/8
2/5*w = 5/8 // : 2/5
w = 5/8/2/5
w = 25/16
w = 25/16
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