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