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