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w in (-oo:+oo)
2/7 = w/3 // - w/3
2/7-(w/3) = 0
2/7-1/3*w = 0 // - 2/7
-1/3*w = -2/7 // : -1/3
w = -2/7/(-1/3)
w = 6/7
w = 6/7
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