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