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