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a in (-oo:+oo)
7-(a/3) <= -14 // + 14
7-(a/3)+14 <= 0
21-1/3*a <= 0 // - 21
-1/3*a <= -21 // : -1/3
a >= -21/(-1/3)
a >= 63
a in <63:+oo)
<63:+oo)
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