6. Fill in the appropriate " ", - , , , 宀 " operation symbols (parentheses can also be used in the equation) to make the following equation true.

Note: The symbol "宀" does not have a direct mathematical meaning in English, so it is kept as is. If you have a specific meaning for this symbol, please provide it.
【Explanation】 $12 \times 12 \div (12+12)=6, (12 \times 12+12) \div 12=13$