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w in (-oo:+oo)
-w/3 < -4 // + 4
4-w/3 < 0
4-1/3*w < 0 // - 4
-1/3*w < -4 // : -1/3
w > -4/(-1/3)
w > 12
w in (12:+oo)
(12:+oo)
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