What is 13y-2x-12-15y

What are you solving for? Are you solving for (y) or (x) or are you just combining "like" terms?

-2x-2y-12

Yea what mayah said. If you are combining "like terms"

To simplify the expression 13y - 2x - 12 - 15y, you can start by combining like terms.

First, combine the terms with the variable 'y'. In this case, you have 13y and -15y, so you can simplify them by subtracting:

13y - 15y = -2y

Next, you have the term -2x. Since it doesn't have any like terms to combine with, it remains as is:

-2x

Finally, you have the constant terms -12. When combining constant terms, you simply add or subtract them:

-12

Now, we can put all the simplified terms together:

-2y - 2x - 12

So, the simplified form of the expression 13y - 2x - 12 - 15y is -2y - 2x - 12.