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