-3:7

The ratio -3:7 represents a relationship between the two numbers -3 and 7. It can be interpreted as "-3 parts of something for every 7 parts of something else." However, in some contexts, the negative sign indicates a direction or an inverse relationship.

If you want to simplify or convert this ratio into a fraction, you can write it as:

\[ \frac{-3}{7} \]

If you need further assistance with this ratio or its application in a specific context, please provide more details!