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11x mas 38x es menor o igual a 40 mas 9
49x es menor o igual a 49
x es menor o igual a 49/49
x =1
2x -5 es mayor o igual a 18 mas x
2x - x es mayor o igual a 18 mas 5
x es mayor o igual a 23
x=(24 25 26 27 28 .........)