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x in (-oo:+oo)
x/8-1 < 6*x // - 6*x
x/8-(6*x)-1 < 0
x/8-6*x-1 < 0
-47/8*x-1 < 0 // + 1
-47/8*x < 1 // : -47/8
x > 1/(-47/8)
x > -8/47
x in (-8/47:+oo)
(-8/47:+oo)
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