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x in (-oo:+oo)
3-((7/4)*x) > 9 // - 9
3-((7/4)*x)-9 > 0
(-7/4)*x-9+3 > 0
-7/4*x-6 > 0 // + 6
-7/4*x > 6 // : -7/4
x < 6/(-7/4)
x < -24/7
x in (-oo:-24/7)
(-oo:-24/7)
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