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