(-46/7) cannot be reduced further because 46 and 7 have no common factors.
If you want to write this as a mixed numeral this is how
Use the latex button and type in
-6\frac{4}{7} then hit enter
This is what it will look like
$$-6\frac{4}{7}$$
Now mathematician,
Use the LaTex button to write this properly
15 and 4 over 13
If you get it right I will give you thumbs up. :)