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x in (-oo:+oo)
-x/8 > -6 // + 6
6-x/8 > 0
6-1/8*x > 0 // - 6
-1/8*x > -6 // : -1/8
x < -6/(-1/8)
x < 48
x in (-oo:48)
(-oo:48)
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