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w in (-oo:+oo)
28 = (-7/6)*w // - (-7/6)*w
28-((-7/6)*w) = 0
(7/6)*w+28 = 0
7/6*w+28 = 0 // - 28
7/6*w = -28 // : 7/6
w = -28/7/6
w = -24
w = -24
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