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W in (-oo:+oo)
W/9 < -2 // + 2
W/9+2 < 0
1/9*W+2 < 0 // - 2
1/9*W < -2 // : 1/9
W < -2/1/9
W < -18
W in (-oo:-18)
(-oo:-18)
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