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