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w in (-oo:+oo)
6/7 = 3*w // - 3*w
6/7-(3*w) = 0
6/7-3*w = 0
6/7-3*w = 0 // - 6/7
-3*w = -6/7 // : -3
w = -6/7/(-3)
w = 2/7
w = 2/7
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