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w in (-oo:+oo)
(1/2)*w-3 = (-7/3)*w-(7/3) // - (-7/3)*w-(7/3)
(1/2)*w-((-7/3)*w)+7/3-3 = 0
(1/2)*w+(7/3)*w+7/3-3 = 0
17/6*w-2/3 = 0 // + 2/3
17/6*w = 2/3 // : 17/6
w = 2/3/17/6
w = 4/17
w = 4/17
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