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a in (-oo:+oo)
6-(a/3) < 2 // - 2
6-(a/3)-2 < 0
4-1/3*a < 0 // - 4
-1/3*a < -4 // : -1/3
a > -4/(-1/3)
a > 12
a in (12:+oo)
(12:+oo)
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