An equation is a mathematical statement saying that two amounts or values are the same, for example 6x4=12x2.
N-COUNT
（多種因素需加以綜合考慮的）平衡，綜合體
An equation is a situation in which two or more parts have to be considered together so that the whole situation can be understood or explained.
例句
The equation is simple: research breeds new products...情況很簡單：研究產生新產品。The party fears the equation between higher spending and higher taxes...該黨擔心難以平衡更多支出和更高稅率之間的綜合關系。