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x in (-oo:+oo)
x/9 < 5 // - 5
x/9-5 < 0
1/9*x-5 < 0 // + 5
1/9*x < 5 // : 1/9
x < 5/1/9
x < 45
x in (-oo:45)
(-oo:45)
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