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w in (-oo:+oo)
7 > 10-((3/8)*w) // - 10-((3/8)*w)
(3/8)*w-10+7 > 0
3/8*w-3 > 0 // + 3
3/8*w > 3 // : 3/8
w > 3/3/8
w > 8
w in (8:+oo)
(8:+oo)
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