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x in (-oo:+oo)
6-((8/7)*x) > 9 // - 9
6-((8/7)*x)-9 > 0
(-8/7)*x-9+6 > 0
-8/7*x-3 > 0 // + 3
-8/7*x > 3 // : -8/7
x < 3/(-8/7)
x < -21/8
x in (-oo:-21/8)
(-oo:-21/8)
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