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x in (-oo:+oo)
7-((2/3)*x) < x-8 // - x-8
7-((2/3)*x)-x+8 < 0
(-2/3)*x-x+7+8 < 0
15-5/3*x < 0 // - 15
-5/3*x < -15 // : -5/3
x > -15/(-5/3)
x > 9
x in (9:+oo)
(9:+oo)
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