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r in (-oo:+oo)
r/6 < 18 // - 18
r/6-18 < 0
1/6*r-18 < 0 // + 18
1/6*r < 18 // : 1/6
r < 18/1/6
r < 108
r in (-oo:108)
(-oo:108)
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