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w in (-oo:+oo)
3/14 = (-5/7)*w // - (-5/7)*w
3/14-((-5/7)*w) = 0
(5/7)*w+3/14 = 0
5/7*w+3/14 = 0 // - 3/14
5/7*w = -3/14 // : 5/7
w = -3/14/5/7
w = -3/10
w = -3/10
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