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x in (-oo:+oo)
x/3 < 3 // - 3
x/3-3 < 0
1/3*x-3 < 0 // + 3
1/3*x < 3 // : 1/3
x < 3/1/3
x < 9
x in (-oo:9)
(-oo:9)
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