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w in (-oo:+oo)
(1/2)*w > 2 // - 2
(1/2)*w-2 > 0
1/2*w-2 > 0 // + 2
1/2*w > 2 // : 1/2
w > 2/1/2
w > 4
w in (4:+oo)
(4:+oo)
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