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x in (-oo:+oo)
(9/19)*x < 18 // - 18
(9/19)*x-18 < 0
9/19*x-18 < 0 // + 18
9/19*x < 18 // : 9/19
x < 18/9/19
x < 38
x in (-oo:38)
(-oo:38)
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