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w in (-oo:+oo)
10 = (8/10)*w // - (8/10)*w
10-((8/10)*w) = 0
(-4/5)*w+10 = 0
10-4/5*w = 0 // - 10
-4/5*w = -10 // : -4/5
w = -10/(-4/5)
w = 25/2
w = 25/2
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