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x in (-oo:+oo)
6-((2/5)*x) > 9 // - 9
6-((2/5)*x)-9 > 0
(-2/5)*x-9+6 > 0
-2/5*x-3 > 0 // + 3
-2/5*x > 3 // : -2/5
x < 3/(-2/5)
x < -15/2
x in (-oo:-15/2)
(-oo:-15/2)
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