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x in (-oo:+oo)
3-((5/7)*x) > 9 // - 9
3-((5/7)*x)-9 > 0
(-5/7)*x-9+3 > 0
-5/7*x-6 > 0 // + 6
-5/7*x > 6 // : -5/7
x < 6/(-5/7)
x < -42/5
x in (-oo:-42/5)
(-oo:-42/5)
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