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w in (-oo:+oo)
5/7-(2/7) = (-1/3)*w+(2/3)*w // - (-1/3)*w+(2/3)*w
5/7-((-1/3)*w)-((2/3)*w)-(2/7) = 0
(1/3)*w+(-2/3)*w+5/7-2/7 = 0
3/7-1/3*w = 0 // - 3/7
-1/3*w = -3/7 // : -1/3
w = -3/7/(-1/3)
w = 9/7
w = 9/7
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