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x in (-oo:+oo)
(1/2)*x-((4/5)*x) > 1/3 // - 1/3
(1/2)*x-((4/5)*x)-(1/3) > 0
(1/2)*x+(-4/5)*x-1/3 > 0
-3/10*x-1/3 > 0 // + 1/3
-3/10*x > 1/3 // : -3/10
x < 1/3/(-3/10)
x < -10/9
x in (-oo:-10/9)
(-oo:-10/9)
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