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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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