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