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t in (-oo:+oo)
(3/2)*t-7 < 2 // - 2
(3/2)*t-7-2 < 0
3/2*t-9 < 0 // + 9
3/2*t < 9 // : 3/2
t < 9/3/2
t < 6
t in (-oo:6)
(-oo:6)
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