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t in (-oo:+oo)
(5/3)*t-1 < 2 // - 2
(5/3)*t-2-1 < 0
5/3*t-3 < 0 // + 3
5/3*t < 3 // : 5/3
t < 3/5/3
t < 9/5
t in (-oo:9/5)
(-oo:9/5)
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