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|3x+1| < |2x-12|
(3x+1)^2 < (2x-12)^2
9x^2+6x+1 < 4x^2-48x+144
5x^2+54x-143 < 0
(x+13)(5x-11) < 0
-13 < x < 11/5 ; x e R