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a in (-oo:+oo)
(-3*a)/7 > -6 // + 6
(-3*a)/7+6 > 0
6-3/7*a > 0 // - 6
-3/7*a > -6 // : -3/7
a < -6/(-3/7)
a < 14
a in (-oo:14)
(-oo:14)
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