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