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X in (-oo:+oo)
(-5/8)*X-8 > -7 // + 7
(-5/8)*X-8+7 > 0
-5/8*X-1 > 0 // + 1
-5/8*X > 1 // : -5/8
X < 1/(-5/8)
X < -8/5
X in (-oo:-8/5)
(-oo:-8/5)
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