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x in (-oo:+oo)
x/9 < 4 // - 4
x/9-4 < 0
1/9*x-4 < 0 // + 4
1/9*x < 4 // : 1/9
x < 4/1/9
x < 36
x in (-oo:36)
(-oo:36)
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