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METEOROLOGIST JEFF HABY. F = 9/5*C + 32. To find the temperature both scales are equal we can use another equation and combine it with this previous equation. The equation is simply F = C. Plug in for F or C and solve. C = 9/5*C + 32. -4/5*C = 32. F = 9/5*F + 32. -4/5*F = 32. Thus, at the cold temperature of negative 40, this temperature is the same on both the Fahrenheit and Celsius temperature scales.
Tc = (5/9)*(Tf-32); Tc = temperature in degrees Celsius, Tf = temperature in degrees Fahrenheit. For example, assume you have a Fahrenheit temperature of 98.6 degrees and you desire to convert it into degrees on the Celsius scale. Updated: 2/1/13. Leave us a question or comment on Facebook.