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x in (-oo:+oo)
(2*x)/5 < 25 // - 25
(2*x)/5-25 < 0
2/5*x-25 < 0 // + 25
2/5*x < 25 // : 2/5
x < 25/2/5
x < 125/2
x in (-oo:125/2)
(-oo:125/2)
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