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w in (-oo:+oo)
(3/8)*w+5 = 9*w // - 9*w
(3/8)*w-(9*w)+5 = 0
(3/8)*w-9*w+5 = 0
5-69/8*w = 0 // - 5
-69/8*w = -5 // : -69/8
w = -5/(-69/8)
w = 40/69
w = 40/69
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