質問: (x+a) find ‘a’
回答: **Step-by-step explanation:** a= ![ - 4 \div 3](https://schoollearningcommons.info/wp-content/ql-cache/quicklatex.com-dbd47fd70e1a90d4875416f0e7f5aecb_l3.png "Rendered by QuickLaTeX.com")