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In Rust, you can create mutable variables and change their values. If you have a memory location represented by a mutable variable, you can change its value using the assignment operator =.

Here's an example of changing the value of a mutable variable representing a memory location:

fn main() {
    let mut num = 10;
    println!("Original Value: {}", num); // Output: Original Value: 10

    num = 20;

    println!("New Value: {}", num); // Output: New Value: 20
}

In this example, the variable num is created with an initial value of 10. Then, the value of num is changed to 20 by using the assignment operator =.

It's important to note that in Rust, you can't directly manipulate raw memory. All memory operations must go through a safe API provided by Rust's standard library or external libraries. This is done to prevent unsafe behavior and memory errors.