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w in (-oo:+oo)
-4/7 = (-2/3)*w-(1/2) // - (-2/3)*w-(1/2)
1/2-((-2/3)*w)-4/7 = 0
(2/3)*w-4/7+1/2 = 0
2/3*w-1/14 = 0 // + 1/14
2/3*w = 1/14 // : 2/3
w = 1/14/2/3
w = 3/28
w = 3/28
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