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w in (-oo:+oo)
(2/6)*w > 2.5 // - 2.5
(2/6)*w-2.5 > 0
1/3*w-2.5 > 0 // + 2.5
1/3*w > 2.5 // : 1/3
w > 2.5/1/3
w > 7.50000008
w in (7.50000008:+oo)
(7.50000008:+oo)
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