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w in (-oo:+oo)
12 = (-2/9)*w // - (-2/9)*w
12-((-2/9)*w) = 0
(2/9)*w+12 = 0
2/9*w+12 = 0 // - 12
2/9*w = -12 // : 2/9
w = -12/2/9
w = -54
w = -54
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