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w in (-oo:+oo)
9 = (-3/8)*w // - (-3/8)*w
9-((-3/8)*w) = 0
(3/8)*w+9 = 0
3/8*w+9 = 0 // - 9
3/8*w = -9 // : 3/8
w = -9/3/8
w = -24
w = -24
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