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w in (-oo:+oo)
12 = (-2/7)*w // - (-2/7)*w
12-((-2/7)*w) = 0
(2/7)*w+12 = 0
2/7*w+12 = 0 // - 12
2/7*w = -12 // : 2/7
w = -12/2/7
w = -42
w = -42
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