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w in (-oo:+oo)
4-(6*w) = w/2+(1*3)/2 // - w/2+(1*3)/2
4-(6*w)-(w/2)-((1*3)/2) = 0
4-6*w-(w/2)-3/2 = 0
5/2-13/2*w = 0 // - 5/2
-13/2*w = -5/2 // : -13/2
w = -5/2/(-13/2)
w = 5/13
w = 5/13
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