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x in (-oo:+oo)
(4*x)/5-5 < x/5-8 // - x/5-8
(4*x)/5-(x/5)-5+8 < 0
3/5*x+3 < 0 // - 3
3/5*x < -3 // : 3/5
x < -3/3/5
x < -5
x in (-oo:-5)
(-oo:-5)
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