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r in (-oo:+oo)
1/2 < r/(-3) // - r/(-3)
1/2-(r/(-3)) < 0
1/3*r+1/2 < 0 // - 1/2
1/3*r < -1/2 // : 1/3
r < -1/2/1/3
r < -3/2
r in (-oo:-3/2)
(-oo:-3/2)
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