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## Homework Statement

Calculate the one temperature at which Fahrenheit and Celsius thermometers agree with each other.

## Homework Equations

T

_{F}= T

_{C}* (9/5) + 32°C

T

_{C}= ( T

_{F}+ 32 ) * (5/9)

T

_{K}= T

_{C}+ 273.15

## The Attempt at a Solution

*Shrug* I can't even understand how to set it up...

**4. The answer**

-40°C