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w in (-oo:+oo)
20 = (-4/3)*w // - (-4/3)*w
20-((-4/3)*w) = 0
(4/3)*w+20 = 0
4/3*w+20 = 0 // - 20
4/3*w = -20 // : 4/3
w = -20/4/3
w = -15
w = -15
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