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sorry guys, really new at this, i'm trying to do the extra credit and i have to write an equation converting fahrenheit to celsius. very basic i'm assuming, but i honestly don't know what to do. please help

Ok, so first you need the calculation for the conversion. A quick google search reveals that we first subtract 32 from the Fahrenheit value and then we multiply by 5/9ths to get the Celsius.

Alright, I'll get you started with some code that assigns a Fahrenheit value to a variable and then prints it out later. You insert the formula to convert it to Celsius in the middle. (Use an Xcode playground or similar so you can see if it works.)

```let fahrenheitValue = 32

let celsiusValue =    //here's where you insert the formula using fahrenheitValue

println(celsiusValue)
```

That should print `0` if you got the formula right. If that works, change `fahrenheitValue` to other numbers to see if they work also. Here are some to try:

212°F = 100°C (change to `let fahrenheitValue = 212` and `100` should print out)

104°F = 40°C

68°F = 20°C

-40°F = -40°C

PLUS

Vise versa if you want to convert Celsius back to Fahrenheit:

let celcius: Double = 37 // I found that if I didn't specify it was a double it was rounding up and I couldn't see the right number

let fahrenheitValue: Double = (9/5) * celcius + 32

println(fahrenheitValue)