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a in (-oo:+oo)
(3*a)/2 < 24 // - 24
(3*a)/2-24 < 0
3/2*a-24 < 0 // + 24
3/2*a < 24 // : 3/2
a < 24/3/2
a < 16
a in (-oo:16)
(-oo:16)
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