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x in (-oo:+oo)
(2/5)*x-5 > 3 // - 3
(2/5)*x-5-3 > 0
2/5*x-8 > 0 // + 8
2/5*x > 8 // : 2/5
x > 8/2/5
x > 20
x in (20:+oo)
(20:+oo)
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