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x in (-oo:+oo)
(7*x)/5-4 < 16 // - 16
(7*x)/5-16-4 < 0
7/5*x-20 < 0 // + 20
7/5*x < 20 // : 7/5
x < 20/7/5
x < 100/7
x in (-oo:100/7)
(-oo:100/7)
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