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x in (-oo:+oo)
(-1/8)*x-6 > -9 // + 9
(-1/8)*x-6+9 > 0
3-1/8*x > 0 // - 3
-1/8*x > -3 // : -1/8
x < -3/(-1/8)
x < 24
x in (-oo:24)
(-oo:24)
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