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w in (-oo:+oo)
2/21 = (-5/7)*w // - (-5/7)*w
2/21-((-5/7)*w) = 0
(5/7)*w+2/21 = 0
5/7*w+2/21 = 0 // - 2/21
5/7*w = -2/21 // : 5/7
w = -2/21/5/7
w = -2/15
w = -2/15
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