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X in (-oo:+oo)
X/(-5) > 8 // - 8
X/(-5)-8 > 0
-1/5*X-8 > 0 // + 8
-1/5*X > 8 // : -1/5
X < 8/(-1/5)
X < -40
X in (-oo:-40)
(-oo:-40)
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