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w in (-oo:+oo)
20 = (5/2)*w // - (5/2)*w
20-((5/2)*w) = 0
(-5/2)*w+20 = 0
20-5/2*w = 0 // - 20
-5/2*w = -20 // : -5/2
w = -20/(-5/2)
w = 8
w = 8
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