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x in (-oo:+oo)
x/3 < 23/7 // - 23/7
x/3-(23/7) < 0
x/3-23/7 < 0
1/3*x-23/7 < 0 // + 23/7
1/3*x < 23/7 // : 1/3
x < 23/7/1/3
x < 69/7
x in (-oo:69/7)
(-oo:69/7)
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