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w in (-oo:+oo)
-6/7 = (-1/2)*w-(4/3) // - (-1/2)*w-(4/3)
4/3-((-1/2)*w)-6/7 = 0
(1/2)*w-6/7+4/3 = 0
1/2*w+10/21 = 0 // - 10/21
1/2*w = -10/21 // : 1/2
w = -10/21/1/2
w = -20/21
w = -20/21
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