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w in (-oo:+oo)
8/7 = 4*w // - 4*w
8/7-(4*w) = 0
8/7-4*w = 0
8/7-4*w = 0 // - 8/7
-4*w = -8/7 // : -4
w = -8/7/(-4)
w = 2/7
w = 2/7
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