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a in (-oo:+oo)
6 < (7/2)*a-15 // - (7/2)*a-15
6-((7/2)*a)+15 < 0
(-7/2)*a+6+15 < 0
21-7/2*a < 0 // - 21
-7/2*a < -21 // : -7/2
a > -21/(-7/2)
a > 6
a in (6:+oo)
(6:+oo)
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