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w in (-oo:+oo)
(2/3)*w-(1/6) = 5/18 // - 5/18
(2/3)*w-(1/6)-(5/18) = 0
(2/3)*w-1/6-5/18 = 0
2/3*w-4/9 = 0 // + 4/9
2/3*w = 4/9 // : 2/3
w = 4/9/2/3
w = 2/3
w = 2/3
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