# Basic JavaScript - Compound Assignment With Augmented Subtraction

Tell us what’s happening: please give some feedback
Describe your issue in detail here.

``````let a = 11;
let b = 9;
let c = 3;

// Only change code below this line
a -= 6;
b -= -15;
c -= 2;
``````

User Agent is: `Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36`

Challenge: Basic JavaScript - Compound Assignment With Augmented Subtraction

Look carefully at the example given in the exercise’s description: you need to use it as a model. Also, there’s something that’s not supposed to be there in your code.

not getting it

``````a -= 6;
b -= -15;
c -= 7;`````````

We can come up with some generic example

If I say

``````stuff = stuff  - anotherStuff
``````

it’s the same as

``````stuff -= anotherStuff
``````

helps. got a and b. stuck on c for some reason.

``````a -= 6;
b -= 15;
c -= -3;
``````

you have originally

``````c = c - 1;
``````

so why are you using `-3` here?

honestly IDK. I was trying to get it right. Math is not my strong suit. I am an artist by experience (and DNA :-))

1 Like

understood
So, still stuck? or solved it?

thanks. I solved it. no idea how I did yet but started to figure it out

This is a negative number: `-3`

don’t think I am dumb yet I don’t get the importance of being a negative number

This step is not about math or negative/positive numbers actually.

Here they are just showing you some syntax, how things can be written in JavaScript

I can write in the code:

``````a = a + 100;
``````

it will work

but I can be a little bit more consice:

``````a += 100
``````

ahhh. now that makes sense to me. thank you

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