def decode_pairs(data: str, key: str, default_value: str) -> str:
    # Escribe tu solución aquí
    if len(data) == 0:
        return default_value
    
    data_dictionary = {} 

    for element in data.split(";"):
        if element.split("=")[0] not in data_dictionary:
            data_dictionary[element.split("=")[0]] = element.split("=")[1] 

    return data_dictionary.get(key, default_value)