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w in (-oo:+oo)
2/27 = (-7/9)*w // - (-7/9)*w
2/27-((-7/9)*w) = 0
(7/9)*w+2/27 = 0
7/9*w+2/27 = 0 // - 2/27
7/9*w = -2/27 // : 7/9
w = -2/27/7/9
w = -2/21
w = -2/21
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