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