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