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x in (-oo:+oo)
(3*x)/5 < 1 // - 1
(3*x)/5-1 < 0
3/5*x-1 < 0 // + 1
3/5*x < 1 // : 3/5
x < 1/3/5
x < 5/3
x in (-oo:5/3)
(-oo:5/3)
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