Unsure what I'm doing wrong

[HannahQuix]

I’ve tried multiple different things, can’t get the first 3 check marks to appear after doing what I think is right. I need help understanding this in general

Your code so far

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

// Only change code below this line
a += 3 + 12;
b += 9 + 17;
c += 12 + 7;

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36.

Challenge: Compound Assignment With Augmented Addition

Link to the challenge:

freeCodeCamp.org

[caryaharper]

You should not have added the extra numbers, it should just be 12, 9, and 7. What you’ve written is a valid operation, but it is not what the test wants. The test say what they expect a,b,c to be assigned to so you should console.log(a,b,c), and see what their values are

[allyza.fabellar]

Having the += sign means adding the left side to the right side. So what you’re having here is that you’re adding a + 3 + 12 which makes your a now equal to 3 + 3 + 12 whick is 18.

Instead of having redundant variables on the same line, your test expects you to simplify the operation by adding the value of the given variable to a certain number. Kindly look closely at the example :

var myVar = 1;
myVar += 5;

myVar is now equal to 6
If you make it:

var myVar = 1;
myVar += myVar + 5;

myVar is now equal to 7

[twotani]

a += b is equivalent to, or shorthand for, a = a + b. So, if you want the effect of

let a = 3;
a = a + 5; // a is 8 now

you can write

let a = 3;
a += 5;

When you write

let a = 3;
a += 3 + 5; //now a is 11

you are doing

let a = 3;
a = a + (3 + 5);