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x in (-oo:+oo)
1-((5/8)*x) > 7 // - 7
1-((5/8)*x)-7 > 0
(-5/8)*x-7+1 > 0
-5/8*x-6 > 0 // + 6
-5/8*x > 6 // : -5/8
x < 6/(-5/8)
x < -48/5
x in (-oo:-48/5)
(-oo:-48/5)
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