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r in (-oo:+oo)
-r/3 < 15 // - 15
-r/3-15 < 0
-1/3*r-15 < 0 // + 15
-1/3*r < 15 // : -1/3
r > 15/(-1/3)
r > -45
r in (-45:+oo)
(-45:+oo)
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