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x in (-oo:+oo)
8-((9/4)*x) > 9 // - 9
8-((9/4)*x)-9 > 0
(-9/4)*x-9+8 > 0
-9/4*x-1 > 0 // + 1
-9/4*x > 1 // : -9/4
x < 1/(-9/4)
x < -4/9
x in (-oo:-4/9)
(-oo:-4/9)
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