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