1. Convertir 30 mm a cm: 30 \text{ mm} = 3 \text{ cm}
2. Sumar el largo del letrero y las distancias a la izquierda y a la derecha: 8.3 \text{ cm} + 3 \text{ cm} + 4 \text{ cm} = 15.3 \text{ cm}
3. Resultado final: 15.3 \text{ cm}
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