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p in (-oo:+oo)
(2/3)*p < 18 // - 18
(2/3)*p-18 < 0
2/3*p-18 < 0 // + 18
2/3*p < 18 // : 2/3
p < 18/2/3
p < 27
p in (-oo:27)
(-oo:27)
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