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w in (-oo:+oo)
12 = (-8/3)*w // - (-8/3)*w
12-((-8/3)*w) = 0
(8/3)*w+12 = 0
8/3*w+12 = 0 // - 12
8/3*w = -12 // : 8/3
w = -12/8/3
w = -9/2
w = -9/2
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