Basic JavaScript - Compound Assignment With Augmented Addition

EDIT: Solucionado.

Tell us what’s happening:
¿Alguien ha podido dar con el resultado de esto?

Your code so far

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

// Only change code below this line
a = 3 + 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/106.0.0.0 Safari/537.36

Challenge: Basic JavaScript - Compound Assignment With Augmented Addition

Link to the challenge:

You did not change any of the code. What part of the instructions do you not understand?

Done.

Solo tenia un problema de concatenación.