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x in (-oo:+oo)
(2*x)/5 < 8/10 // - 8/10
(2*x)/5-(8/10) < 0
(2*x)/5-4/5 < 0
2/5*x-4/5 < 0 // + 4/5
2/5*x < 4/5 // : 2/5
x < 4/5/2/5
x < 2
x in (-oo:2)
(-oo:2)
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