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x in (-oo:+oo)
(-5/7)*x-8 > -1 // + 1
(-5/7)*x-8+1 > 0
-5/7*x-7 > 0 // + 7
-5/7*x > 7 // : -5/7
x < 7/(-5/7)
x < -49/5
x in (-oo:-49/5)
(-oo:-49/5)
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