Basic JavaScript - Compound Assignment With Augmented Addition

JavaScript
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Hey am 15 years old and am trying to get into coding maybe do this as my work when i get older but am stuck on this problems can i get help please.

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

// Only change code below this line
a = a + 11;
b = b + 9;
c = c + 7;

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Challenge: Basic JavaScript - Compound Assignment With Augmented Addition

Link to the challenge:

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You need to change the last three lines to use the += operator instead of the + operator. Don’t change the numbers in those lines.

Look at the example in the instructions:

myVar += 5;

This is the same thing as:

myVar = myVar + 5;

So you need to convert the last three lines in the challenge from the longer form which uses just the + operator to the shorter form that uses the += operator.

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