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x in (-oo:+oo)
(7*x)/2 < 5 // - 5
(7*x)/2-5 < 0
7/2*x-5 < 0 // + 5
7/2*x < 5 // : 7/2
x < 5/7/2
x < 10/7
x in (-oo:10/7)
(-oo:10/7)
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