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a in (-oo:+oo)
(1/3)*a-((2/3)*a)-2 < -5 // + 5
(1/3)*a-((2/3)*a)-2+5 < 0
(1/3)*a+(-2/3)*a-2+5 < 0
3-1/3*a < 0 // - 3
-1/3*a < -3 // : -1/3
a > -3/(-1/3)
a > 9
a in (9:+oo)
(9:+oo)
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