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x in (-oo:+oo)
5/18-x-(2/9) < x-(4/6) // - x-(4/6)
5/18-x-x-(2/9)+4/6 < 0
5/18-x-x-2/9+4/6 < 0
13/18-2*x < 0 // - 13/18
-2*x < -13/18 // : -2
x > -13/18/(-2)
x > 13/36
x in (13/36:+oo)
(13/36:+oo)
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