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w in (-oo:+oo)
20 = (5/9)*w // - (5/9)*w
20-((5/9)*w) = 0
(-5/9)*w+20 = 0
20-5/9*w = 0 // - 20
-5/9*w = -20 // : -5/9
w = -20/(-5/9)
w = 36
w = 36
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