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x in (-oo:+oo)
-x/10 < 8 // - 8
-x/10-8 < 0
-1/10*x-8 < 0 // + 8
-1/10*x < 8 // : -1/10
x > 8/(-1/10)
x > -80
x in (-80:+oo)
(-80:+oo)
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