Final answer:
The equivalent expression to -1/4 - 5/3 is -23/12.
Step-by-step explanation:
The expression -1/4 - 5/3 can be simplified by finding a common denominator and then subtracting the fractions. The common denominator for 4 and 3 is 12.
So, -1/4 can be converted to -3/12 and -5/3 can be converted to -20/12.
Subtracting -3/12 from -20/12 gives us -23/12. Therefore, the equivalent expression is -23/12.