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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
5/9*w+20 = 0 // - 20
5/9*w = -20 // : 5/9
w = -20/5/9
w = -36
w = -36
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