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r in (-oo:+oo)
-4/9 < (-5/12)*r // - (-5/12)*r
-((-5/12)*r)-4/9 < 0
(5/12)*r-4/9 < 0
5/12*r-4/9 < 0 // + 4/9
5/12*r < 4/9 // : 5/12
r < 4/9/5/12
r < 16/15
r in (-oo:16/15)
(-oo:16/15)
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