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a in (-oo:+oo)
-a/8 < 5 // - 5
-a/8-5 < 0
-1/8*a-5 < 0 // + 5
-1/8*a < 5 // : -1/8
a > 5/(-1/8)
a > -40
a in (-40:+oo)
(-40:+oo)
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