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X in (-oo:+oo)
X/(-2) > 8 // - 8
X/(-2)-8 > 0
-1/2*X-8 > 0 // + 8
-1/2*X > 8 // : -1/2
X < 8/(-1/2)
X < -16
X in (-oo:-16)
(-oo:-16)
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