Basic JavaScript - Compound Assignment With Augmented Addition

Tell us what’s happening:
Describe your issue in detail here.

Your code so far

let a = 3;
let b = 17;
let c = 12;

// Only change code below this line

a = a + 12;
b = 9 + b;
c = c + 7;

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36

Challenge: Basic JavaScript - Compound Assignment With Augmented Addition

Link to the challenge:

You have not changed any of the code. What is your question?