I think your idea for the function is wrong
The function returns a variable “fahrenheit”
in the body of the function you need a general formula for calculating the value of “fahrenheit” using the parameter “celsius”
and finally in the last part you test with different value of celsius
In a line like this " 0 = (celcius * (9/5)) + 32;" ( you wrote)
you are actually assigning the value of the right-hand side to the left-hand side of the equal sign
the problem is 0 is not a variable, it’s a fixed number, you can’t assign value to it…