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