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r in (-oo:+oo)
-r/3 < 6 // - 6
-r/3-6 < 0
-1/3*r-6 < 0 // + 6
-1/3*r < 6 // : -1/3
r > 6/(-1/3)
r > -18
r in (-18:+oo)
(-18:+oo)
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