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-1《 2x - 1《 4
-1 《 2x - 1 y 2x - 1 《 4
0《 2x y 2x 《 5
0《 x y x 《 5/2
Doble desigualdad : 0 《 x 《 5/2
Solución : [ 0, 5/2 ]