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