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w in (-oo:+oo)
8/10 = w/25 // - w/25
8/10-(w/25) = 0
4/5-1/25*w = 0 // - 4/5
-1/25*w = -4/5 // : -1/25
w = -4/5/(-1/25)
w = 20
w = 20
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