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a in (-oo:+oo)
(3/2)*a < 7 // - 7
(3/2)*a-7 < 0
3/2*a-7 < 0 // + 7
3/2*a < 7 // : 3/2
a < 7/3/2
a < 14/3
a in (-oo:14/3)
(-oo:14/3)
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