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w in (-oo:+oo)
(2/3)*w-(2/7) = (5/6)*w-(5/7) // - (5/6)*w-(5/7)
(2/3)*w-((5/6)*w)-(2/7)+5/7 = 0
(2/3)*w+(-5/6)*w-2/7+5/7 = 0
3/7-1/6*w = 0 // - 3/7
-1/6*w = -3/7 // : -1/6
w = -3/7/(-1/6)
w = 18/7
w = 18/7
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