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x in (-oo:+oo)
(4/3)*x-(15/6) < 3*x // - 3*x
(4/3)*x-(3*x)-(15/6) < 0
(4/3)*x-3*x-5/2 < 0
-5/3*x-5/2 < 0 // + 5/2
-5/3*x < 5/2 // : -5/3
x > 5/2/(-5/3)
x > -3/2
x in (-3/2:+oo)
(-3/2:+oo)
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