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x in (-oo:+oo)
-5/7 > 8*x // - 8*x
-(8*x)-5/7 > 0
-8*x-5/7 > 0
-8*x-5/7 > 0 // + 5/7
-8*x > 5/7 // : -8
x < 5/7/(-8)
x < -5/56
x in (-oo:-5/56)
(-oo:-5/56)
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