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#1) At what temperature are the Fahrenheit and Celsius temperatures exactly equal?

In order to answer this question, I set the following equal:

(the asterisk represents the degree sign)

*F = 1.8 (*C) + 32

*C = ((*F) - 32)/1.8

1.8 (*C) + 32 = ((*F) - 32)/1.8

1.8 (*C) = *F

And I know this is incorrect. Please tell me how to do this.

#2) At what temperature are the Fahrenheit and Celsius temperatures the same value but opposite in sign?

I have no idea how to do this one let alone the previous one. please help.