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x in (-oo:+oo)
-x/7 > -5 // + 5
5-x/7 > 0
5-1/7*x > 0 // - 5
-1/7*x > -5 // : -1/7
x < -5/(-1/7)
x < 35
x in (-oo:35)
(-oo:35)
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