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w in (-oo:+oo)
5.5 > w/0.5 // - w/0.5
5.5-(w/0.5) > 0
5.5-2*w > 0
5.5-2*w > 0 // - 5.5
-2*w > -5.5 // : -2
w < -5.5/(-2)
w < 2.75
w in (-oo:2.75)
(-oo:2.75)
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