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w in (-oo:+oo)
-2/3 = (-1/2)*w-(3/7) // - (-1/2)*w-(3/7)
3/7-((-1/2)*w)-2/3 = 0
(1/2)*w-2/3+3/7 = 0
1/2*w-5/21 = 0 // + 5/21
1/2*w = 5/21 // : 1/2
w = 5/21/1/2
w = 10/21
w = 10/21
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