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a in (-oo:+oo)
(1/2)*a < 12 // - 12
(1/2)*a-12 < 0
1/2*a-12 < 0 // + 12
1/2*a < 12 // : 1/2
a < 12/1/2
a < 24
a in (-oo:24)
(-oo:24)
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