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x in (-oo:+oo)
(4*x)/3 > 8*x-20 // - 8*x-20
(4*x)/3-(8*x)+20 > 0
(4*x)/3-8*x+20 > 0
20-20/3*x > 0 // - 20
-20/3*x > -20 // : -20/3
x < -20/(-20/3)
x < 3
x in (-oo:3)
(-oo:3)
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