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a in (-oo:+oo)
a/(-6) < 1 // - 1
a/(-6)-1 < 0
-1/6*a-1 < 0 // + 1
-1/6*a < 1 // : -1/6
a > 1/(-1/6)
a > -6
a in (-6:+oo)
(-6:+oo)
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