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w in (-oo:+oo)
w/(-3) > -6 // + 6
w/(-3)+6 > 0
6-1/3*w > 0 // - 6
-1/3*w > -6 // : -1/3
w < -6/(-1/3)
w < 18
w in (-oo:18)
(-oo:18)
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