What's negative multiples of 3 in set builder-notation

Multiples of 3 are {3, 6, 9, 12, 15, 18, 21, 24, 27, 30, ...}, these are all the multiples of 3.

Now, we are looking a negative multiple of 3, which means, we need to a negative value of 3 multiples.

=> - 3 {-3, - 6, - 9, - 12, - 15, - 18, - 21, - 24, - 27, - 30, ... } These are all the negative multiple of 3 in set builder notation.

Notice, that the numbers are of divisible by 3. Any number that Is divisible by 3 is called multiple of 3.