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## temperature_conv
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### Instructions
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Write two functions which convert values of temperatures from `fahrenheit` to `celsius` and the other way around.
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To pass this exercise you must use (9/5) in **both** functions.
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### Expected functions
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```rust
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pub fn fahrenheit_to_celsius(f: f64) -> f64 {
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}
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pub fn celsius_to_fahrenheit(c: f64) -> f64 {
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}
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```
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### Example
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```rust
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use temperature_conv::*;
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fn main() {
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println!("{} F = {} C", -459.67, fahrenheit_to_celsius(-459.67));
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println!("{} C = {} F", 0.0, celsius_to_fahrenheit(0.0));
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}
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```
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And its output:
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```console
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$ cargo run
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-459.67 F = -273.15 C
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0 C = 32 F
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$
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```
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