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x in (-oo:+oo)
1 > x/7-9 // - x/7-9
1-(x/7)+9 > 0
10-1/7*x > 0 // - 10
-1/7*x > -10 // : -1/7
x < -10/(-1/7)
x < 70
x in (-oo:70)
(-oo:70)
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