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w in (-oo:+oo)
-w/3 > 3 // - 3
-w/3-3 > 0
-1/3*w-3 > 0 // + 3
-1/3*w > 3 // : -1/3
w < 3/(-1/3)
w < -9
w in (-oo:-9)
(-oo:-9)
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