You can't convert "59-77f" directly to Celsius because it's not a valid temperature reading. It looks like a mathematical expression, not a temperature.

Here's why:

* "f" likely stands for Fahrenheit: Temperature scales use symbols to differentiate them (like °C for Celsius and °F for Fahrenheit).

* The expression lacks a clear temperature: It seems like you might be trying to subtract 77 from 59, but it's unclear what this represents in terms of temperature.

To convert a temperature from Fahrenheit to Celsius, you'll need a specific Fahrenheit value. Here's the formula:

Celsius = (Fahrenheit - 32) * 5 / 9

Example: If you wanted to convert 77 degrees Fahrenheit to Celsius:

Celsius = (77 - 32) * 5 / 9 = 25 degrees Celsius